Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

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George A. Hufford; Anita G. Longley; William A. Kissick, "A Guide to the Use of the ITS Irregular Terrain Model in the Area Prediction Mode," NTIA Technical Report TR-82-100, April 1982

The ITS model of radio propagation for frequencies between 20 MHz and 20 GHz (the Longley–Rice model) is a general purpose model that can be applied to a large variety of engineering problems. The model, which is based on electromagnetic theory and o...