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The most important element in a radio circuit is the antenna. You may have a powerful transmitter and a frequency, but without the correct antenna, communication will be less than desirable, if not impossible.
This subcourse provides information necessary to make the right choice for an antenna and how to select the correct frequency depending upon the environmental conditions.
Without an understanding of wave propagation, decisions on frequency selection and antennas could result in no communications.
 Antennas/Theory
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