Abstract: This invention is directed to a apparatus that includes an inflatable antenna reflector assembly for generating electromagnetic plane waves. The apparatus can be used in a variety of applications in which plane waves are beneficial, such as in a compact range to simulate the long-range behavior of a radar system to test a target for its radar signature. The inflatable reflector assembly of the apparatus includes a base, an arched frame mounted to the base, and an envelope-like cover that fits over the frame. The cover's front side is transmissive to electromagnetic waves, and its rear side is reflective to such waves. The apparatus can include a point source antenna feed, in which case the cover's reflective portion is made to be parabolic, or the antenna feed can be a line source, in which case the cover's reflective portion is spherical. The base can be rested directly on the floor or ground for support.