Abstract: Besides broadband, fully polarized, and high gain radiation, radar antennas applied in air target detection are also required to achieve wide beam radiation in azimuth plane and cosecant beam radiation in elevation plane, which demands a deliberate tradeoff between beam coverage and gain. In this paper, based on traditional horn-reflector, a modified design is proposed to achieve widely different beam patterns in azimuth and elevation planes in X band with a fractional bandwidth of 40%. The proposed horn-reflector is fed with a dual polarized coaxes-to-waveguide transition for dual polarization radiation. The designed horn-reflector is simulated, fabricated, and experimentally tested. Both simulated and measured results demonstrate that the proposed horn-reflector features 30°-wide beam in azimuth plane and cosecant-shaped beam from 0°to 60° in elevation plane. The proposed horn-reflector is compact and highly efficient, promising for miniaturized and lightweight systems.