a constant impedance bandswitched input filter for use in a wideband signal receiver includes a low pass filter , a high pass filter and a bandpass filter for reducing intermodulation distortion as well as for providing a flat input impedance characteristic . the bandpass filter resonates at the crossover frequency between the low and high pass filters for minimizing insertion loss while maintaining a constant termination impedance across the entire input signal bandwidth to reduce the input standing wave ratio . switching means are provided for coupling the high and low pass filters as well as the bandpass filter in circuit depending upon the frequency band tuned to . the constant z bandswitched input filter is particularly adapted for use in a wide band cable television system for substantially reducing intermodulation distortion and signal reflections arising from impedance mismatches , but has application in any cable operated multichannel communications system .