The work is focuses on the determination of the attenuation factor of electromagnetic radiation when applied in soils with different physical properties as a criterion for assessing the depth of Ground-penetrating radar (GPR) method. The measurements were performed using a tunable coaxial resonator which frequency range coincides with one normally used in the practice of GPR. The attenuation factor of a sample of soil placed in a cavity is determined by the shift and width of the resonance line. Advantage of this method is the preservation of soil structure during the measurement.

Keywords: ground-penetrating radar, properties of soils, attenuation factor.