To use a distribution line and a telephone line, etc., in a broadcasting and communication, etc.

The antenna terminal of a transmitter is connected to one single line of the distribution line and the telephone line, etc., with a capacitor which is intrinsically synchronized with a transmission frequency and a grounded terminal is grounded. But an electric power frequency in the case of the distribution line and the transmission call and reception call frequency in the case of the telephone line are adopted as the ones being different from the transmission frequency of the transmitter. The antenna terminal of a receiver is connected to the single line such as the distribution line and the telephone line, etc., where the transmitter is provided in the above method with the capacitor which is intrinsically synchronized with the transmission frequency and the grounded terminal is grounded. But, when a variable capacitor is used so as to enable receiving multiple stations, the electric power frequency and the transmission call and reception call frequency are not synchronized with the variable capacitor.