||In recent years, the pressure on frequency resources owing to the increase in wireless communication systems has become a problem. In addition, this problem is expected to become even more serious in light of the expansion of the usage area of the 5th generation mobile communication system (5G) that will be deployed in the future. However, focusing on time and place, there are unused frequency resources, and secondary use of unused bands by the primary system is being considered to improve the frequency utilization efficiency. For secondary use, it is necessary to estimate the transmitted wave source position; however, it has not been possible conventional method because of multipath and antenna size problems. In previous study, a method for estimating the wave source location of the primary system using an UAV has been investigated, and clarified the effectiveness of the method by conducting simulations. In this study, we explain the experimental apparatus that we developed. We also show the results of actual measurements using the apparatus in an urban environment to investigate the relationship between the patch antennas in six directions and the main wave directions.