
In radio systems, a biconical antenna is a broad-bandwidth antenna made of two roughly conical conductive objects, nearly touching at their points. Biconical antennas are broadband dipole antennas, typically exhibiting a bandwidth of 3 octaves or more. The conical conductors need not be solid cones nor infinitely long. A simple conical monopole an...
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http://en.wikipedia.org/wiki/Biconical_antenna

a symmetrical antenna formed by two conducting cones, having a common axis and adjacent vertices, at which they are fed
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=712-04-34
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