an antenna switching circuit which selectively transmits , to a receiver , rf signals from a plurality of antennas including rf signals of different frequency bands such as the vhf band and the mf band using a single output terminal . to prevent a level drop of rf signals of one of the frequency bands due to a common use of the output terminal , a unidirectional switching element is added to a switching circuit network by which the selection of rf signals from the different antennas is performed . a branching circuit for separating rf signals of different frequency bands is provided with an attenuation operation using a variable impedance characteristic of a semiconductor switching element which is basically on - off operated for the switching between the rf signals of the different frequency bands .