Considering the service zone of a powerful transmitter broadcasting in kilometric waves

France is one of the countries best served by broadcasting in the kilometric band. While signals are received from four transmitters (Allouis, Saarlouis, Radio Monte Carlo, and Radio Luxembourg), there is concern about the quality of reception, especially from Allouis, the national broadcasting transmitter, because the field of service of this transmitter has always been the entire territory. A study of the conditions of listening and of methods for improving confront led to the establishment of charts of zones of coverage (field contours). The diagram of favorable radiation, the effect of interference between ground and ionospheric waves, the eliminations of radioelectric interferences, and the formation of adequate antiparasite regulations are discussed.