June 1974 | NTIA Technical Memo OT TM 74 174

The radiation fields from HF coastal antennas

Randolph H. Ott

Abstract: The radiation fields (i. e., elevation patterns) of HF coastal antennas are computed for several possible terrain profiles near land-sea bound­aries. The numerical technique for evaluating the radiation fields is compared with analytical formulas if the latter exist for the specific profile in question. The results appear to indicate that adequate low-angle coverage can be obtained from an antenna on a sloping beach using vertical polarization without the use of a ground screen or sea water in front of the antenna.

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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