End fed / long wire antenna Multiple wavelength long wire End fed half wave antenna W3EDP antenna The end fed half wave antenna is an attractive option for many radio hams as it is able to provide multiband operation without the use of traps or stubs whilst occupying a minimum amount of space and not presenting a very ugly visual impact. Obviously the end-fed radiator does need something to "push against" (ref. The End Fed Antenna: Killer or Compromise? The classic sloper antenna is a top-fed 1/4 wave vertical antenna sloping down and away from a tower. Although not necessary, a 1:1 isolation/choke balun (models, 1110, 1113, 1115 etc.) The need for expanding an End-Fed with such a "counterpoise" wire was already recognized well over a century ago! 12), just like all antenna radiators. … Continue reading "Portable Antennas: The EARCHI End Fed" 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. It consists of 30ft of wire fed into a 9:1 UnUn (Unbalanced to Unbalanced). For each model the inductance and capacitance values of three alternative impedance matching networks are computed to match to a 50-ohm line. at the transmitter end of feedline will stop RF from entering your equipment and reduce receiver noise caused by common mode currents. End fed half wave antenna: One method of providing a multi-band antenna for the amateur radio or ham bands is to use an end fed half wave antenna. Figure 5 - Ideal End Fed Half Wave Length Antenna. Problems With End Fed Half Wave Antennas •#1 Problem: Common mode currents on feedline •RF in shack •High noise levels on receive •Feedline and grounding can affect SWR and tuning •Isolating the feedling from the antenna can be difficult, even with a common mode choke •High voltages, even at low power •FCC RF exposure limits can be exceeded at low power levels It might seem that an "end-fed" is a monopole antenna: there is no explicit "counterpoise" in most end-fed designs. One advantage of the end fed half wave antenna over an end fed "random" wire antenna is that it can be used on bands harmonically related to the band it is cut for without a tuner. End-Fed Antenna projects and plans category is a curation of 63 web resources on , QRO End Fed Half Wave Antenna Coupler, N2CX on End-Fed Halfwave Antennas, Endfed wire antenna tuner by KC8AON. This antenna has been made popular by the Emergency Amateur Radio Club of Hawaii (EARCHI). One other note. Resources listed under End-Fed Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. T his program models a wide range of end-fed antennas used with a ground system of radial wires. This antenna is a half wavelength at the lowest frequency of operation, and then as the other bands on which t can be used are harmonically related, it provides a multiple number of half wavelengths. This article is of a "homebrew" nature which includes a "review" of my experience using a 10-40m HEARC (Honolulu Emergency ARC) end fed matchbox antenna installed in a unique way from an RV park. In the search for the “Wonder Antenna” that is small, portable and easy to setup, I’ve decided to build an Endfed antenna using a 9:1 match. By design, ununs are wound is such a manner that they provide little or no RF choking. 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