In a broadcast signal receiver to which a multi-directional antenna having a plurality of signal receiving directions is connected through an antenna controller for controlling the multi-directional antenna, even when the antenna controller is erroneously connected to the broadcast signal receiver, a tuner circuit and a power supply circuit of the broadcast signal receiver is protected from over current caused by a driving voltage of the antenna controller used for switching the effective signal receiving direction of the multi-directional antenna. A polymeric protection switch is provided between a connector to which a coaxial cable connected to the antenna controller be connected and the tuner circuit.