PURPOSE: To receive a wave in the direction where maximum composite directivity can be obtained by adjusting the antenna direction so that a disturbing wave arrives in the horizontal direction with ±90° to the front surface direction of antenna directivity and then by arranging the antenna so that a desired wave is synthesized in phase.

CONSTITUTION: So that a disturbing wave arrives at angles of ±90° to the front surface directions of two antennas 1 and 2, their antenna directions are adjusted and the both are placed at an interval in the disturbing wave direction. Then, the sensitivity of each antenna to the disturbing wave is zero, so that no disturbing wave output appears. Further, phase shifter 3 is interposed in the feeder of antenna 1 closer to the arrival direction of a desired wave so as to mix the desired radio wave by mixer 4 in phase.