
A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane. The driving signal from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the lower end of the monopole and ...
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http://en.wikipedia.org/wiki/Monopole_antenna

an antenna composed of one or more conductors usually rectilinear, perpendicular to a conductive surface, and energized between the conductive surface and the near end of the conductors
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=712-04-51
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