Abstract: A test chamber for measuring total radiated power, total isotropic sensitivity, and antenna efficiency is disclosed. The chamber takes the shape of a hollow ellipsoid. RF energy radiated from one focal point of the ellipse reflects off the walls of the ellipse and is collected at the second focal point of the ellipse. A single power measurement at the second focal point measures the total power radiated from the first focal point. The subject matter of the present disclosure significantly reduces the measurement time for these three parameters, and is applicable to the design, production, and repair of antennas and wireless devices.