LF and MF propagation: An approximate formula for estimating sea gain.
The strength of waves propagated via the ionosphere at LF and MF may be increased if either path terminal is situated near the sea. This increase, which is known as sea gain, depends both on the distance of the terminal from the coast and on the extent of the sea beyond the coastline. An approximate formula is derived for estimating sea gain for all geographical situations which are likely to be encountered.
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