Abstract: A device for rotating a parabolic antenna (10) by an actuator (20) to enable reception of electric waves transmitted from a plurality of satellites with the antenna (10). A data for rotating the antenna (10) to enable reception from each satellite at a predetermined receiving position is stored in a ROM (24). A CPU 22 sets the antenna (10) in a position corresponding to the data in the ROM (24) for each satellite different initial receiving from the former for each satellite. From this state, the antenna (10) is moved east and west to detect disappearance of a synchronizing signal which is part of a signal from a tuner (18) by a synchronizing signal detector (50), and the midpoint of the positions of disappearance of the synchronizing signal in the east and west is stored in a RAM (26) as a position of the best receiving condition. The data in the RAM (26) is read out by a control unit (36) and the position of the antenna (10) is changed correspondingly.