January 1969 | Technical Memorandum ERL TM 158
A note on selected definitions of effective antenna heights
Cite This Publication
James L. Montgomery, “A note on selected definitions of effective antenna heights,” Technical Memorandum ERL TM 158, U.S. Department of Commerce, Environmental Science Services Administration, Institute for Telecommunication Sciences and Aeronomy, January 1969.
James L. Montgomery
Abstract: This report describes an experiment in which some computations are compared with available field strength data. Several models are proposed which compute an effective height by using a least squares fit to various sections of the terrain profile. Also proposed are several models based on a Rayleigh criterion for roughness to compute a roughness (or scattering) factor. Cumulative distributions are presented of the attenuation error for each combination of an effective height model with a roughness n1.odel. Consideration of all nine antenna-height measurements indicates that the combination of structural heights (model I) and exponential factor (model B) has the smallest medians and interdecile ranges of any group.
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