A smart antenna configuration estimator for use in a digital TV receiver comprises data input means operable to obtain an estimate of an impulse response of a channel through which the television signal has passed to the receiver, maximum finding means operable to find the maximum value of the channel impulse response, the maximum value corresponding to a main signal path, averaging means operable to calculate a mean of values of the channel impulse response comprising channel impulse response values corresponding to one or more additional signal paths, and ratio calculating means operable to calculate a quality value as the ratio of the maximum value to the mean of values of the channel impulse response.