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An end-fed half-wave antenna, or EFHW, is a half-wavelength wire fed at one end instead of the middle. It radiates much like a dipole, but the radio and feed line can sit at the base of a single support while the wire runs up into a tree or up a pole. A step-up transformer, usually a 49:1 or 64:1 unun, matches its high impedance to coax, and the same wire works on its harmonics, covering several bands without a tuner. It is a favorite of Parks on the Air activators. Read more…