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Since the establishment of the method for the measurement of radiation from FM and TV receivers, by Subcommittee 12-A of the International Electrotechnical Commission (IEC), the problem of establishing the conversion factor between the IEC method and the IRE method has aroused great interest. Because of the irregular radiation patterns of the receivers, the conversion factor may be determined preferably on a statistical rather than a theoretical basis. Here the procedure is described by which the radiation measurements were carried out on 74 FM receivers, using both methods, and the site calibrations were made. The results are analyzed and the basic concept of correlation factor introduced, in order to convert the limits of one method to the limits of the other.