Abstract: Based on the Reynolds-averaged N-S equations and Reynolds stress equation model (RSM), the numerical simulation is performed on a vehicle-mounted radar antenna. In the simulation, the inlet boundary type is defined as velocity inlet with wind velocity section in specified exposure category. The drag coefficients of the antenna are obtained and compared with the results of computational models in which the boundary velocity is uniform velocity. The effects of working height and wind velocity on the antenna characteristics of antenna in atmospheric boundary layer are studied. The results show that the drag coefficients of antennas will be increased along with the working height and wind velocity, and the effect of the ground roughness to the drag coefficients is decided by the position relative to the normal height.