Ground-Penetrating Radar has become a popular non-destructive and non-invasive tool in different kind of applications:
civil engineering, archaeology, concrete and masonry analysis, etc. The selection of the antenna frequencies depends on
the application, but each antenna has a radiation pattern and some characteristics that have influence in the final
interpretation and in the model obtained for the studied medium. The knowledge of these features and its coupling
effects with the medium could improve the results of the GPR prospecting studies. In this work, some experimental
procedures were carried out in order to obtain the 1.6 GHz centre frequency antenna characteristics in the air and in one
material medium and to compare them. First, the study of the attenuation due to geometrical spreading was performed.
This result was compared with the amplitude attenuation in a material medium, deduced from the GPR experimental
data. Second, the shape of the radiation pattern was estimated in laboratory for different distances between the target and
the antenna. Near field and far field were considered during the experimental data acquisition. Third, the relative
amplitude of the reflected wave (in dB) was obtained depending on the relative position of the antenna over the target.
The shape of the radiation pattern and the relative amplitudes obtained in the air were compared with those obtained in a
slow medium (water). This slow medium was characterized with the wave velocity and the attenuation factor of the GPR