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The corner antenna, being widely used in practice in the UHF band, is the classical model for illustrating the influence of the electromagnetic waves diffraction on the reflector edges on the directivity D of the radiating system. The experimental measurements of the directivity of finite — size corner-reflector antenna have been carried out by the authors [1] for numerical combinations of the width L and height W of the reflector under varying each from 0.4λ to 5λ.