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a methodology for connecting multiple LF/MF/HF receivers to a single antenna via readily available and inexpensive 75-ohm TV cable.

The document provides fundamental information on radio wave propagation and NVIS communication, covering line of sight, surface waves, and ionospheric reflection.<p> It focuses on the Near Vertical Incidence Skywave (NVIS) method for reliable coverage in mountainous or skip zones, especially for regional and emergency communications.