Abstract: The specification discloses a radar antenna which is fabricated by forming a plurality of elongated flat ribs each having an inwardly curved forward edge. Slots extending normally from the forward or rearward edge are formed along the length of each of the ribs. A plurality of the ribs are oriented vertically and the slots therein are mated with the slots in a plurality of the ribs which are disposed horizontally. The vertical and horizontal ribs are thus interconnected in a rigid lattice network which defines a plurality of rectangular compartments. The inwardly curved forward edges of the ribs in the lattice network define a contoured shape for an antenna reflecting surface. A screen is attached over the forward edges in order to provide a reflecting surface on the radar antenna.