PURPOSE: To preset each channel to the optimum state rejecting the ghost interruption and to increase the SN ratio of output, by providing phase shifters to each channel and compensating the loss with the use of the broad band amplifier.

CONSTITUTION: The broad band amplifier 8 is connected to the output of one antenna among the antennas 6 and 7 having the same performance, and the output is branched with the branch unit 9. The output branched into a plurality of channels is mixed again at the mixing circuit 12 via the phase shifters 10a ... and variable attenuators 11a... . Further, the output and that introduced from the antenna 7 are mixed with the mixer 13 to introduce the result to the television set etc. By presetting the phase shifter and variable attenuator at each channel, optimum reception is made at all channels, and since the output of the two antennas is synthesized at the mixer without attenuation, increased S/N ratio is obtained.