Abstract: An antenna (10) having a plurality of stripline antennas (12). Each stripline antenna (12) is comprised of a plurality of radiating elements (14). The plurality of stripline antennas (12) are arranged in a flat array. The shape of each radiating element (14) is prescribed by an exact mathematical expression whose dimensions are a function of the radiating wave length, characteristics of the directional pattern and the input resistance of the antenna (10). Electromagnetic energy is supplied via a rectangular waveguide (40) and arrives at the input ends of the stripline antennas (12) via an excitation device (20), a gradual junction (28) and a radial bend (30).