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The EF5 antenna is a wired monoband 3.5 MHz, 1/2 wave, designed...
Wired loop with a perimeter of 86 m, with non-inductive load, made of...
21 MHz 1/4 wave vertical antenna delivered with 3 wire radians. Very robust tubes with large diameters and thicknesses (2 mm), wide bandwidth, very low SWR. Connection to the 50 ohm coaxial cable directly by SO-239 (no balun or other adaptation system). On perfect ground the gain reaches 5.15 dBi and the radiation lobes favor DX.