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 ionosphere is a region of the Earth’s upper atmosphere that is ionized primarily by ultraviolet rays from the Sun. The Earth’s ionosphere has the property that it will refract or bend radio waves passing through it. The ionosphere is not a single “blanket” of …
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