To provide an inexpensive plane radiation antenna which never impairs the landscapes, can be stably attached and held and also can be safely installed despite a large area secured for reception.

A square framework consisting of the horizontal frames 52 and 52 and the vertical frames 53 and 53 which are made of a conductive material is used as an antenna main body. Then the resonance axes 51 and 51 are placed opposite to both frames 52, and the feeding points 9 and 9 are set at the tip sides of both shafts 51. A plane radiation antenna of such a constitution is used as a common antenna that can transmit and receive the radio waves or as one of plural receiving antennas which receive the radio waves from the common antenna. Thus, the radio waves are transmitted by radio to the radio interference noise areas via a radio transmission unit having a transmitter means which transmits the received radio waves.