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This article proposes a methodology and considers the results of experimental studies of the influence of the antenna radome on the characteristics of the radio system installed under it. To study the influence, a technique was developed and tested to determine the level of signal attenuation in the radome wall during thermal heating. A detailed description of the methodology for measuring the level of signal attenuation in the radome wall is given. For research, a special stand has been created that allows measurements of the level of signal attenuation in the radome wall when it is heated. Measurements were made of the level of signal attenuation in the radome wall during heating in accordance with a given temperature dependence on exposure time. Based on the analysis of the results obtained, it was found that an increase in the level of signal attenuation can lead to a deterioration in the radio characteristics of the microwave system «antenna-radome» and the radio system as a whole.