Far-field polar patterns of a surface-wave array at 20 Mc/s

A large surface-wave interferometer array for the reception of long-range high-frequency signals has been described in the literature. The E and H plane polar patterns were measured initially by tethered-balloon methods at a range of 50 wavelengths. These results, which have been verified now by the use of an aircraft at a range of three miles, can explain the excellent operational performance of the array.