R. H. Ott; Lewis E. Vogler; George A. Hufford

Abstract: An algorithm (PROGRAM WAGNER) that evaluates HF ground–wave attenuation over irregular, inhomogeneous terrain is used to compare calculated field strengths with observed measurements for 9 actual paths and frequencies ranging from 120 kHz to 50 MHz. All comparisons show encouraging agreement between calculations and measurement. The 20 MHz comparisons over the Colorado Mountains provided a challenge for PROGRAM WAGNER.

Keywords: irregular terrain; HF-VHF groundwave prediction; integral equation method; measurement comparisons; radio propagation

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