Abstract: The attitude of an antenna which is used with an artificial satellite emitting a radio wave is controlled by a combination of the establishment of an antenna attitude in accordance with gyro data, a small range conical scan which is conducted when a reception level is less than a first reference and at or above a second reference and is relatively high for altering the antenna attitude to a direction which provides a higher reception level, and a broader range search scan which is conducted when the reception level is less than the second reference and is relatively low for altering the antenna attitude to a direction which provides a higher reception level.