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The results of complex radio physical investigations of the possibility to adapt over-the-horizon radar antenna to radiowave propagation conditions are presented. For this purpose, shipborne navigation radars with different antennas were used. To define the adapted parameters, a great volume of statistical data concerning propagation path parameters, above water duct heights and shipborne navigation radar coverage range was used. For each area of investigation, the coverage range distribution functions are given. From the analysis of the obtained data, a conclusion about over-the-horizon radar antenna adaptation to radiowave propagation conditions is made.