Efhw sloper vs inverted v

 

The 265ft model using the myantenna transformer MEF-110-2K is great for 160,80,60,40,30 and rub it in a inverted L part vertical and the rest horizontal or sloping a bit up or down Test Results for the Sloper vs Inverted-V Dipole on 80/40 meters. This is particularly true at our fairly low 40 foot test height. There are three types of antenna feeds in popular use: 1) transformer feed, 2) L-matching network feed, and 3) Zepp. 2 meter elevation (40 feet). This is 60 ft with a 15 ft stub mast on which there is a tribander and VHF beams. Specifications: • Frequency: 7. In the past, I’ve set up the antennas as either a vertical or in an inverted L. I also use a 'low' tower to support an inverted L. The EFHW16040 is an inverted L, while the EFHW8010 is a straight line up around 50 feet. 94 out of 5 based on 128 customer ratings. Mounted in this fashion, the end fed half wave makes an excellent NVIS (Near Vertical Incedent Skywave) antenna that gives good coverage out to around 300 miles on the low bands 30 thru 80 meters. This could easily route a wire about 25' or more up and 45' sideways, just right for 1/2wl of 40 meters. The difference in receive signal is night and day different. Par EndFedz® Antennas EFT-102040. When configured in the inverted-L, the extensions The 75- and 40-meter NVIS dipoles provide a standard against which we can measure other basic NVIS antennas. If you don't need the feed point to be nearby, consider an inverted V -- avoid the loss in the matching network. Comes with a rugged insulated-wire radiator that prevents detuning when contacting limbs/branches. An Insulator Loop (not pictured) is permanently installed on the far end of the Antenna Wire. 0. Half Delta Loop Antenna. ) and direction, feed line length and type, geographic location and soil condition, calibration and accuracy of SWR instruments used. This is impossible for most amateur radio operators, therefore the modeling data that follows is based on a 12. A round reflection dome develops between each half-wavelength. 12 dBi down to 2. Same with the OCF. Your dipole's total length is feet. I have used an EFHW antenna, mounted in an inverted vee shape from the top of a 5m extendable fiberglass pole, using qrpguys EFHW tuner and a counterpoise wire along the ground and with 4W CW I have worked all over North America and even worked Spain and New Zealand - same setup. The EFHW Attachment is used to connect the Antenna Wire for an End Fed Half Wave antenna. 0 – 21. Wind the toroid. Use 2% for 22 degrees. As I had to dismantle it for installing the EFHW, I could not make a direct comparison on the same band conditions. Here is a little comparison between my homemade Terminated End Fed antenna and a traditional EFHW antenna. 200, 144. 7 MHz (10m) • SWR (frequency ranges listed above EFHW-8010-1K EFHW ANTENNA The perfect antenna for DXing, EMCOM, ALE HF-link sta-tions, NVIS, MARS, ARES, RACES … Various installations such as horizontal, vertical, an inverted V, as well as inverted L, zigzag etc. Lower elevation means poorer results on 80, 40, 30 and 20 meters. although Jul 20, 2020 · W9HJ QRZ Lifetime Member #294 Platinum Subscriber Life Member QRZ Page. Gain drops by 2/3 from 6. 99 – $ 234. Two common, and often confused, types of “end fed” antennas are the end fed half wave (EFHW) and end fed long wire (EFLW or Random Wire). Connect it to the shield side and run below the antenna. This is due to the wire end impedance of a 1/2λ dipole being close to 2450Ω, which is the feed point impedance of an EFHW (ie at the secondary of the impedance matching transformer). 13 dBi (which equals 0. Feb 21, 2024 · It was clearly worse than my modified 40 m inverted V. 5. Inverted v sloper, flat top and in different places with other peoples gear, same results. 12 dBi at 40 feet down to 2. I could get a good match on 40 1:1 and 20 was decent or perfect with my tuner. Remember, higher is better. This can best be configured as an inverted L with ½ wl vertical and the other half horizontal. I explored a range of matching unit designs. There are some trade offs in The most telling part for me was in comparing the 40m inverted-V configuration to a horizontal configuration: However, about 2/3 of the total inverted-V signal is lost to ground when compared to a straight EFHW wire at 40 feet; from 6. Inverted L might have a slightly lower angle of radiation but if that vertical part is closer to your house you will loose some signal from the nearby obstruction. 0 - 7. com/use •Inverted-V •Inverted-L •Sloper •Operates on harmonics. The coupler was tuned to resonance on the bench first using a resistive load. HWEFs are good, but they are notorious for CMCs for the above reasons (but can be tamed). 0 dbi gain at (at 55� away from vertical). An end-fed half wave (EFHW) antenna would be naturally resonant, but would need to be over 250 ft (76m) long. I know because I use one with my motorhome because it is easy to deploy. A typical ferrite core transformer as above with a 7:1 turns ratio (49:1 impedance ratio) or more will be “helpful”. Improved version of the EFHW-7510-2K, now with three large cores, 3-inch diameter, featuring just 0. That’s a 50:1 impedance mismatch for a 50 Ω output radio (SWR of 2500/50=50:1). The issue is that, for example, the 80 meter version is 135 feet long and when fed on 40 meters it is two ½ wl’s long. A 40M EFHW will have a low VSWR on 40/20/15/10M with an appropriate loading coil •End feeding allows smaller wire to be used since you don’t have to support the feedline •Low cost, easy to home brew •The EFHW is not the popular multiband offset fed wire using a 9:1 balun • Inverted V, angle at apex should not be less than 90 degrees. 13 dBi when sloping (Signal points up at 25� away from vertical). At lower heights, ground losses increase, although contacts are often still possible with the antenna 1m (3 feet) above the ground, or even less. Apr 7, 2022 · Since you're in an apartment, sounds like a 0. SWR TECH NOTE:The SWR graphs shown are specific to the conditions listed including antenna height, configuration (flat top, inverted V, inverted L, etc. Enter The Frequency For The Dipole/Vee Antenna Calculation. The plan Thursday - June 20, 2019 CM Standardized OCF vertical for 2-radial model converted to EFHW with variable bend point and angles CM #14 AWG. are possible. But how much of a compromise is it if we have to squeeze in an inverted-V?Connect with my channel by subscribing be an inverted “L” configuration. Also, contrary to popular opinion, transmitting on it is good also. 5 dB Insertion loss 3-30MHz! This is an End-Fed Half-Wave (EFHW*) antenna for 75/40/30/20/17/15/12 and 10m bands. The end fed wire with 9:1 unun will work very well in a variety of configurations but it is probably best as horizontal, even if it is not in a straight line (that is, crooked, bent). Nearly every POTA activator I know has at least one. CM L-bend ratio is adjustable based on Length. On 80 M, and with a horizontal antenna at a typical height of 30 ft, the difference in gain at low radiation angles 22 degrees and lower is even more pronounced. G5RV's either work - or they don't. etc, and use that. This is a common antenna configuration in the world of amateur radio referred to as a "Sloper" or more accurately, "Half-Wave Sloper". Look into a resonant end fed half wave or EFHW, which will operate on its fundamental design frequency and most harmonics. Leave the tuner and SWR meter at 2004-11-25. 5=center. The SWR values you show are right where they should be. Double Extended Zepp Antenna. The Antenna Wire is comprised of 65 feet of strong, lightweight 20-gauge wire and a small loading coil. 3 wavelengths. Inverted V is a handy sorta-omnidirectional antenna. These antennas used tuned air coupled transformers, two coils near each other, with a variable capacitor to tune the antenna. But the inverted V was about 1 m higher and the antenna wire much straighter, though the highest point was not at the feedpoint. Last year I put up an end fed at the back Sales/Support: 760-747-3343. Par EndFedz® Lightweight, Trail-Friendly EFT Antenna. Flexibility erecting end feds was recognized in the 1930s where some of the early articles describe single band end feds, Figure 1. One of the most popular antennas today is the end fed long wire antenna due to it ease of installation, portability and stealth in various installations. On the higher bands 20 meters and up it will do a fair job at longer distance. The Inverted-V variant when used should never have the apex angle at the top to be less than 90°-100°. For example, a 40m version at about 64ft long also operates fine on 20, 15 and 10m. 6m) long. Figure 5 The instillation sketch, Figure 6, is that of an Inverted “L” with the 49:1 UNUN mounted the external wall of the house. In this example a pulley and para cord assembly is support 80M 40M 30M 20M 17M 15M 12M and 10M - No Tuner Needed The CHA LEFS 8010 is an eight band, no- tuner, High Frequency (HF) antenna for use on the 80, 40, 30, 20, 17, 15, 12, and 10 meter Amateur Radio Service (ham) bands (60 meters with a tuner). Figure 6 - SWR vs "Counterpoise" Length vs Turns Ratio for an End Fed Half Wave Free Space Antenna. 80 - 10 m. 3. 10m -160m Multiband “Z” Antenna. 2. The inverted-V should have an inside angle of no less than 120 degrees between the elements, and each element end needs to be at least 8-10 feet above ground. The current maximum will be close to the center of basically any half wave Jan 17, 2021 · Dipoles compared: Horizontal vs Inverted-V vs 'Sloper'. 5m). The sloper's feed point is anchored high above ground near the top of the tower on which sits a grounded HF yagi beam antenna. This difference being that the former only work when the wire is some multiple of a Dipole Slope. But what is the difference between a flat-top and an inverted V dipole? Is an Inverted V more omn Sep 24, 2020 · Just be sure you have two supports, such as trees or poles to hang the dipole. The other antenna has its radiator going over a tree limb in an inverted V and acts more like a horizontal. making them very convenient and I have a 135ft end-fed random wire sloper antenna with the 9:1 Unun at 25ft, and the far end about 50ft up. This antenna can be angled anywhere in a range An end-fed half-wave (“EFHW”) antenna has a very high feedpoint impedance, often 1000 to 5000 ohms (depending on the diameter). For 40m different stations try morning, not evening! I have recently got on the HF bands with a 40m EFHW in an inverted V which is being supported on a 10m spiderbeam pole. CM End-fed so use short counterpoise and small inductance for hf tuning. $\endgroup$ Jun 20, 2019 · The solution to improving my send and receive would be making an End Fed Half Wave (EFHW) 10-40 antenna. Each leg of the dipole is feet. • Sloper, make sure overall height of antenna is as far as possible from ground. Jul 30, 2022 · I have been asked by several folks how I configure my antenna for field day. The most convenient location for the aluminum mast is 6 feet away from the fiberglass mast, on a right angle to the horizontal portion of the EFHW (think "L", where the horizontal portion of the EFHW extends due north). Results were quite interesting: similar on 80 m, slightly lower on 40 & 30 m, rather poor on 20 m. A lot of internal tuners are limited as to how large of impedance they can handle. I want to optimize based on a few things: small lot, low-vertical leeway, nosie neighbors and avoiding the power lines in the backyard, I thought that an EFHW 10-40 wire antenna is the best solution. Since the Unun end of the wire is the max current (and max radiated energy) point, I plan to reverse the ends, so that the Unun is at the high Today I built and put up a OCF inverted-v dipole using with a 133 foot total length of #14 insulated THNN with the short leg cut to 44 feet. A wire antenna of that length would be challenging to deploy, even You do need a tuner though and usually you need a counterpoise wire. Avoid placing the lower side of sloper at heights of less than 10 feet (3meters) above ground. Just don’t do #3, it will radiate horribly on the upper bands where the EFHW becomes a full wave or greater! The picture leaves out an option I've frequently seen. Feb 12, 2023 · I have found that end-fed antennas are simpler to deploy in the field, because they can be configured as an inverted V or as a sloper, using only one point of support. For 40m that would be about 65ft for 1/2 wavelength and 20m would be about 33ft. Secondarily, it turns out that the EFHW antenna is relatively insensitive to the physical layout of the radiator. I have a 40-10 EFHW as a sloper. 5 wavelength and so on. You need one shorter piece of wire for the primary and one longer piece for the secondary. The possibilities are numerous, but the most common suggestion is the addition of a single-wire element. . Performance vs practicality plus other considerations when fitting a dipole in limited space. Terminated Sloper Antenna. The transformer feed variety may be broadband and, depending upon its construction may Jun 1, 2018 · The antenna could be used as either an inverted V or a half wave vertical on the higher bands; The challenge with the EFHW is feeding it as the end is a high impedance point (apparently between 2000 – 6000 ohms depending on the surrounding environment). Measured VSWRs are taken with the antenna in an in-verted V shape with the center of Except for the EFHW a counterpoise is always necessary. 0. Hard to beat for the price. The lower half-wave section drops to 0. The "sloping vertical" where the feed point is close to the ground and the wire end is up in the air on a support. Chameleon LEFS-8010. Toss your EFHW over a high limb for an inverted-V, raise the far end high for a powerful sloper, or even go vertical with an inverted-L. Apr 5, 2019 · Great job, Steve. com. The yagi plays the role of a ground plane, while the tower plays the double role of Use 3% for 30 degrees. The correct value is 120°. I have two EFHW’s (commercial units from myantennas. 99. There is a much easier way to feed an End Fed 1/2 wavelength wire: Use a parallel tuned tank circuit consisting of an air core inductor and a tuning capacitor. ?? Nov 28, 2023 · With an inverted vee, try to keep the ends at least half that height above the ground. 160m Linear Loaded Sloper Antenna. Feed point at 110/167 = 65. They seem to fall into two main categories: Nov 16, 2021 · The CHA LEFS is a six-band, no-tuner, High Frequency (HF) antenna for use on the 40, 20, 17, 15, 12, and 10 meter Amateur Radio Service (ham) bands. 8-4MHz get a EFHW-7510-2K-Plus! 130 Feet (39. Slopers are generally known to be good low angle DX antennas, while the inverted-V dipole is generally known to respond to higher angle, regional type signals. Use entries like 7. Over Real ground, Element height fixed at 12 meters. The antenna wire routed form the matching transformer to a transition point (the antenna “L”). In fact, with proper consideration, the C. 00 G5RV with an optimum installation @ 60' center and 20' ends with a tuner and worked the world. The Sloper Antenna Explained. 40m - 80m - 160m Short Dipole Antenna. Below we compare the elevation plots for the typical 130 ft long EFHW or Dipole against a simple 43 ft tall Vertical or a 23 ft tall x 22 ft wide Inverted-L ===>. One goes 66 feet straight up a tree and acts like a vertical. Can be vertical or horizontal (or both). 0 – 29. The inductor I normally use is the airdux variety and a good quality transmitting air variable capacitor. Fantastic antennas! Which Antenna Would You Chose If You Could Only Have One Antenna? The DX Commander, Or An End Fed Half Wave? Hunting POTA From Inside A Park: Are You Only EFHW-8010. E. • Inverted U, or “half square”, vertical sides are always twice shorter than horizontal. The length of the counterpoise is not critical. Jan 20, 2018 · An “Inverted-L” antenna is basically a wire antenna, typically ¼ to ½ wavelength long on the band it is designed for. The key advantage of an end fed half wave is the single high support point with accessible feed and current maximum some distance away from the feed point. I have experimented with a half sloper on 160 m and came to the conclusion that 75ft with the sloper attached at 60 ft is I Haven't really attempted transmitting yet, I'm still playing with mounting and grounding, trying to get the SWR down. It is a minimalistic design and lightweight components are intended for the serious backpacker and outdoor adventurer. Aug 19, 2022 · Dipoles for Ham Radio are the basis of almost all antennas. "Random wire" and end fed half wave (EFHW) are most prominent in this group. I find the noise floor lower with the dipole but also receive strength suffers a little, but the lower noise floor compensates. It can be a condo dweller’s only access to the world of ham radio or the best alternative for a backpacking SOTA (Summits on the Air Dec 1, 2021 · It can easily be configured as an inverted V, Sloper or inverted L. Further analysis of this system is not necessary to illustrate my goal for this answer, which is to show that the radiation pattern of an "EFHW" on its higher bands varies considerably from its pattern when operating on its lowest specified band. 7) is of actual measured data of an end fed half wavelength antenna with an isolated coupler using an 8:1 turns ratio. NOTE: This antenna can’t cover the whole 80/75M band with low SWR, for lower SWR on the upper-end of the band,3. They can be installed as a flat-top or inverted-V. In the past I had a 40. 45 MHz (15m) 28. Discussion about the far field radiation patterns produced by each harmonic of an End Fed Half Wave antenna in inverted V form. Red color indicates the stronger radiation on 3D views. Dark jacketed wire is Apr 21, 2021 · Keep the OCF antenna clear of surrounding objects as much as possible, especially metal. 3 MHz (40m) 14. Rated 4. The classic sloper antenna is a top-fed 1/4 wave vertical antenna sloping down and away from a tower. Sep 18, 2021 · An end fed half wave wire can present a feed point impedance of 2500 Ω or more. Inverted vees and slopers are generally easier to mess with than dipoles or other antennas that must be supported at both ends. The idea is to bring the impedance if a "random wire" down to a value your tuner can handle. 9MHz. Having only a single vertical support or limited horizontal space might be a problem. So by using OHM’s law V = √ (P x R), if we feed the antenna with Due to a question regarding dipole sloping from Don Dernat, VE3DBN, Dave explains all about sloping and using EFHW dipoles. Be sure the ends of your inverted-V are at least eight feet above ground so they aren’t a danger to humans and pets. 2 comparison of an inverted V, center-fed dipole with a linear center-fed dipole: AUTHOR EDITS: The apex angle in my plots here is mislabeled. Apr 22, 2022 · Random Wire (EFLW) Antenna Designs. As seen from the table, an 80 meter antenna at half-Wavelength Height should be at 129. 468 divided by frequency will give you a half wavelength in feet and 10ths of a foot. Matching is done by a parallel LC network. It tunes pretty well on all bands, but I'm adding some counterpoise wires to improve 160 & 80m. The red string is plucked in the center with a low force, while near the end of the string the red string vibrates the blue string with a high force. Remember an antenna using a 9:1 matcher is meant to use a tuner, whether in your radio or external. Model Data by Harmonic. Unlike many END FED antennas on the market, this one does not require Jun 27, 2024 · Chameleon Antenna Lightweight 4010 End Fed Halfwave Sloper Near-Vertical Incident Skywave (NVIS) communication is possible, but dependent on the configuration of the antenna when installed. An end fed antenna whether random or resonant can be set up in various configurations such as a sloper, a vertical, inverted L, etc. I get better signal reports and break pileups easier with the EFHW. 1. 2, 144. Jul 7, 2020 · Jul 7, 2020. Jun 14, 2023 · Just calculate a half wavelength or 1, 1. For a 40M fundamental EFHW, 0. So, if you connect a length of wire that presents an impedance of about 450 Ω to the input, you’ll get an impedance of about 50 Ω on the output. Antenna Wire. I have found that a 17 ft counterpoise works well with a 29 ft radiator. In the Inverted-L configuration, the first portion of the Comes with a rugged insulated-wire radiator that prevents detuning when contacting limbs/branches. These are just my suggested EFHW Antenna configurations. The Practical NVIS Inverted-V for 75 and 40 Meters. EFHW-8010-1K Plus™ Multiband End Fed Half Wave Antenna. EFHW Attachment. Preferably, it should be kept around 120°-130°. Aug 12, 2016 · A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. Here’s a legitimate question. Can be fed with a 1/4 wave ladder line, but will be single banded. Since you only need to put up one pole, do something to get it a little higher. 0 dBd or zero gain). An interesting facet of basic NVIS antennas—the dipole, the 1-λ loop, and the inverted-V—is the suggestion that we can improve antenna gain by placing some form of wire structure below it. Dark jacketed wire is What works better a inverted l install or straight horizontal install. This depends a lot on the immediate surroundings, such as vegetation, ground resistance, metal objects, houses, garages. SWR is less than 1. com) – one for 80 through 10 meters and the other (in a perpendicular orientation)for 160 through 40 meters. One such solution could be an "inverted L" wire antenna: Using a telescopic mast to get the wire up in the air from one balcony, and over to another mast raised from another balcony. Dark jacketed wire is Oct 27, 2022 · 1. For example, I have two EFHW antennas. Can be fed with a broadband high-impedance transformer for multi-band use. The graph below (fig. 200, 7. May 20, 2020 · $\begingroup$ My answer was edited to include the radiation envelope of this system at 3. If you only have one support, you can droop the ends into an inverted-V configuration, which can also save space. The Inverted-L antenna is a common antenna for the 160 meter and 80 meter amateur bands, where typical ¼ wave verticals are impractically tall for most amateurs. 160m Half-Sloper Antenna. As the feed points are suspended from the top of the 12m Spiderbeam mast, the EFHW feed point sits about 7’ above the ground while the EFW feed point is about 11’ off the ground. 9 MHz Full-Wave Loop Antenna. Nov 13, 2012 · I like the idea that you can run a endfed in different ways like inverted L and inverted V or flat or sloper. As we found in earlier notes within this series, the inverted-V center-fed dipole requires a greater center height for maximum performance than a level dipole. 5 feet. In fact, the 9:1 unun that I built is actually an autotransformer. I've gotten over 22,000 km on it. 1 - 14. Lotsa current at the tips when transmitting. Deploy it horizontal, sloping, inverted-L, inverted-V Horizontal/Sloper EFHW fed from tower case study, have some inconsistency between Mar 25, 2020 · I have run this antenna in multiple configurations and could not get it to tune as advertised. 05 x 40 = 2M long will be a good length. Never-the-less the antenna will make contacts with just about any way of stringing it up. Leave the tuner and SWR meter at home – just bring a radio and a pair of boots! To make the most of your CHA LEFS 4010, be sure to peruse the operator's manual. End Fed Long Wire Antennas. My recommendation for a maximum height for an NVIS antenna is about 0. EFHW-7510-2K-Plus, 2000W Multi-Band End Fed Half Wave Antenna. Jul 16, 2021 · Dipoles are often a go-to Antenna for many. The radiation pattern on the fundamental frequency (where the antenna is 1/2 wavelength) will be similar to the same wire fed in the center as a dipole (but this is not the case on harmonics). It uses an FT140-43 or FT240-43 toroid in a 49:1 impedance matching unit at Sep 2, 2017 · I have compared EFHW-8010 (which looks very similar to MFJ) versus full size inverted V wire dipoles (all antennas had their top 14 m off the ground) on 80/40/30/20 m with a WSPRlite beacon. 1/2 Wave End-Fed Inverted V. Dark jacketed wire is Apr 19, 2018 · EFHW Sloping EFHW Inverted-V All of these antenna configurations have a feedpoint around 40 feet from ground. Bullet 110 Inverted L (vertical 25’, horizontal 85’, Bullet-9U (2 feet above ground) – 100 Feet coax, choke at 57 feet from antenna feed point only – two 15’ counterpoises wires. Mar 13, 2020 · The EFHW-8010-2K End-Fed Halfwave 2kW Multiband Antenna with mounting kit by Myantennas. This antenna is Oct 30, 2020 · The ~67 ft. Subscribe: https://youtube. EFHW extends from 3 feet up to 46 feet on the fiberglass mast, and then over to another mast for the horizontal section. Elevate your outdoor radio endeavors with the CHA LEFS 4010's exceptional performance and convenience. Off-Center-Fed Full-Wave Doublet Antenna. Both are single wire, multi-band antennas but they have one fundamental difference. In order to select the better The antenna is most suitable for short range NVIS contacts. 9% of total length. On 40 meters the antenna radiates as two half-waves. 5:1 across the 75, 40 and 20 meter bands. 05L counterpoise is a good idea, as well as chokes. ( 128 customer reviews) $ 204. I have 2 masts (12m and 11. Multiply that by 2 for a full wavelength or 3 for 1. The direction of radiation is the Blue trace on the polar Jun 29, 2020 · NEC4. 225, etc Divided by Freq MHz. Your mileage will vary d Jan 6, 2023 · This is possibly the most popular antenna for Parks On The Air. Total antenna length = 110 + 57 = 167 feet. Variable feedpoint height. Its’ minimalistic design and lightweight components are intended for the serious backpacker and outdoor adventurer. Physical deployment can be done as a sloping, tilted wire, an inverted V, a vertical (with the right tree height) and an inverted L. Insulator Loop. That's a lot of loss! Feb 22, 2021 · A viewer asks: I run an horizontal 80 meter Off Center Fed dipole at home, but I’ve made a 20/40m linked dipole & 40m OCF this winter to test this coming spr antenna. Chameleon LEFS-8010 Lightweight End-Fed Half-Wave Sloper Antenna. This facilitates elevation of the aerial where deploying as simple sloper may have left it hanging close to the ground. e a p ne h na e n na ed TI Figure 2. You don't want to pin the legs directly to the ground; have some line on the ends so the antenna tips are preferably out of reach. Percent smaller for the Inverted Vee. . Twist the shorter piece with the larger piece and wind 3 turns tightly with this twisted wire (one turn means the wire passing through the inside of the toroid one time). The graphic below compares the elevation pattern gains at 90° azimuth intervals for these two configurations; posted in response to the comment of rclocher3. Jul 15, 2021 · The Chameleon CHA LEFS Lightweight End Fed Sloper is a multi band portable HF antenna designed for operation on the 40 through 10 meter band. A 133ft long 80m version will do 80m through 10m plus WARC bands depending on mfr. The balun is offset 3 feet from my tower at the 36 foot level. The following data are for the far field radiation patterns and 3D color views of an End Fed Half Wave Inverted-L antenna with a long, straight radiator at 40 feet and feed point straight down near ground. 80 meters would not work without a tuner Even as a vertical. Dec 28, 2016 · It helps to draw it on a piece of paper. The antenna can be used horizontally or as an inverted L (or inverted L sloper) that uses a cheap fibreglass fishing pole to go up vertically 8m before a further 15m goes out or at an angle to a suitable fixing point. The CHA-LEFS-4010 is designed for the trail and its minimalistic design and lightweight components make this antenna ideal for backpackers, hikers, bikers Jun 11, 2022 · End-fed half-wave (EFHW) antennas provide a convenient way to move the coaxial feedpoint for a half-wave antenna from the center to one end. Tried an OCF dipole for about a month, now I have a 20m dipole on a 40ft mast inverted V. 3) End Fed antennas deployed as a sloper, flat top, inverted L or inverted vee or even as a vertical. Recently mentioned on this list were slopers, inverted Ls and shunt feeding the tower. D. Aug 4, 2020 · What is an EFHW? 1/2 wavelength long antenna, fed on the end. The center connection is an old Carolina Windom 4:1 current balun fed with RG-8X. Sample End-Fed Half Waves. 35 MHz (20m) 21. The EFHW can effectively be deployed like an inverted V which means a 40m EFHW can work with a 6 -10m telescopic fishing pole. #2. Such a problem can be solved by mounting a dipole at a slope. "No-snag" end insulator slides over branches and through foliage without hang-ups. Can be tuned and limited to a single band. May 1, 2021 · Another typical deployment variant that makes it extremely convenient to install the EFHW antenna is the EFHW Inverted-V. dt jc jt ac ku hg iz zu ld hh