A test system for determining a total radiated power of an antenna over the air comprises a measuring device and the base station. The measuring device is embodied to establish a communications connection to the base station to be tested over the air and to initiate and use over the air a function for fixing a present beam-lock function of the base station to be tested. The measuring device is further embodied to identify and measure a maximum effective isotropic radiated power, and to determine the total radiated power from previously known antenna characteristics and the measured maximum effective isotropic radiated power.