Abstract: A first group includes first antennas and a first receiver. A second group includes second antennas and a second receiver. Each of the first antennas outputs a first signal according to a first communication form. Each of the second antennas outputs a second signal according to a second communication form. The first receiver receives the first signals individually outputted from the first antennas using a diversity form. The second receiver receives the second signals individually outputted from the second antennas using a diversity form. The multiplexer supplies the multiplex signal obtained by multiplexing the first signal and the second signal to the transmission line. The demultiplexer supplies the first signal and the second signal obtained by demultiplexing the multiplex signal to the first receiver and the second receiver, respectively.