Re: The Broadband Butterfly ... an HOA-friendly all-HF antenna for your attic
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I would question the efficiency of this antenna as a 16:1 balun wired to a 1200 ohm resister would convert the 1200 ohms to 75 ohms and be low vswr as he measured, but the power would almost all be dissipated in the resister rather radiated. Since the connections are lengths of wire there may be some radiation, but since the currents are very low in the wire due to the 1200 ohm impedance I expect this antenna may measure well, but not work well.
From: TLARC@groups.io <TLARC@groups.io> On Behalf Of George N2APB
Build a simple "terminated dipole antenna" for your attic that will operate across the entire HF band ... without an antenna tuner!