<p>The paper deals with the problems of calibration of measuring antennas used for testing technical means for electromagnetic compatibility. It is indicated that the instruments and methods intended for the calibration of measuring antennas and available in the Russian Federation do not allow us to provide efficient solutions of the problems of testing mainly due to the high levels of uncertainty in measuring the antenna factors. To attain the required parameters of accuracy of measuring the antenna characteristics and, hence, the parameters of electromagnetic compatibility, we developed a&#xa0;complex of high-precision equipment aimed at measuring the characteristics of antennas used for the electromagnetic compatibility testing (EMC) of technical means. By using this equipment, it is possible not only to perform precise measurements of the characteristics of emitted industrial radio noise but also to implement three classical methods of antenna measurements over the metallic substrate (ground plate) in a&#xa0;large semianechoic shielded chamber and the procedure of measurement at small distances. On the basis of the indicated methods, we developed algorithms and methodology for measuring the characteristics of antennas and determination of specialized antenna calibration test sites. We present the main results of development of the measuring equipment, including the results of experimental investigations of the functional capabilities and metrological characteristics of the equipment obtained by using an example of precision resonant dipoles. The obtained results are used to create the technical basis for a&#xa0;system guaranteeing the uniformity of measurements of the characteristics of antennas used for the electromagnetic compatibility tests. The developed large polygonal semianechoic chamber can be regarded as a&#xa0;reference test site both in the Russian Federation and in the countries of CIS, including its application in the interlaboratory comparison tests.</p>