A broadcast receiver for use in a mobile communication terminal includes a receiving antenna and an antenna tuning circuit connected to the receiving antenna. The receiving antenna receives broadcast signals tuned to the resonant frequency of the antenna tuning circuit by changing the resonant frequency. The antenna tuning circuit includes an unwanted voltage suppression circuit that suppresses an unwanted voltage generated due to the rectification effect of a varactor when the receiving antenna receives transmission signals output from the transmission antenna of the mobile communication terminal.