A method and system for selecting a sub-band in a television white space frequency band may include configuring an antenna matching circuit based on the selected sub-band and configuring a bandpass filter based on the selected sub-band. The method may include receiving a first signal through a radio-frequency path including the antenna matching circuit and not including the bandpass filter, measuring a parameter of received first signal, and determining whether the selected sub-band is usable based on the measured parameter of the received first signal. The method may include receiving a second signal through radio-frequency path including the antenna matching circuit and the bandpass filter, measuring a parameter of the received second signal, and determining whether the selected sub-band is usable based on the measured parameter of the received second signal.