Abstract: The present invention relates to an adaptive interference suppression arrangement. In the present arrangement, a main antenna (10) picks up the desired signal and some interfering signal and a small auxiliary antenna (20) is pointed in the direction of the interfering source and picks up a sample of the interfering signal. The interfering sample is then put through a quadrature modulator (24) for adjustment of its phase and amplitude to provide an estimated cancellation signal at the output. This estimated cancellation signal is then combined with the main antenna output to give a corrected signal. After down-converting, the present system detects the power in the corrected signal and a processor (32), in response to such power detection, generates a small dither signal which is added to the control signals to vary the phase and amplitude in the quadrature modulator of the residual interference in the corrected signal.