Cubical Quad Antenna, is this the best directional antenna? - YouTube
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A Simple 2-Element 10-Meter Quad
6-band 5-el Quad (10-20m), HamSphere 4.0 Shop
The Ultimate Guide to 11 Meter CB Antennas
easy quad calculator enter center frequency to get a quad antenna size. This resource is listed under Antennas/Antenna Calculators | Antenna, Calculator, Antennas