Transcription of Antenna Height and Communications Effectiveness
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Antenna Height and Communications Effectiveness
Antenna HeightandCommunications EffectivenessSecond EditionA Guide for City Planners and Amateur Radio OperatorsBy R. Dean Straw, N6BV, and Gerald L. Hall, K1 TDSenior Assistant Technical Editor and Retired Associate Technical EditorCopyright 1999 The American Radio Relay League, Main StreetNewington, CT 06111 Page 1 Executive SummaryAmateur radio operators, or hams as they are called, communicate with stations located allover the world. Some contacts may be local in nature, while others may be literally halfwayaround the world. Hams use a variety of internationally allocated frequencies to accomplish for local contacts, which are primarily made on Very High and Ultra HighFrequencies (VHF and UHF), communicating between any two points on the earth rely primarilyon high-frequency (HF) signals propagating through the ionosphere. The earth s ionosphere actsmuch like a mirror at heights of about 150 miles.
effectiveness as related to the physical height of antennas. The intended audience is amateur radio operators and the city and town Planning Boards before which a radio amateur must sometimes appear to obtain building permits for radio towers and antennas. The performance of horizontally polarized antennas at heights of 35, 70 and 120 feet is
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