Abstract: A system for receiving signals from spatial objects comprising an array fed aperture antenna for producing multiple beam patterns covering a predetermined spatial volume a corresponding feed port for each beam pattern coupled to said array for producing an output when a signal is generated by an object within a corresponding beam pattern, a receiver for receiving the antenna array feed port outputs, and means coupled between the antenna array feed ports and the receiver for automatically coupling only the output of the feed port producing the greatest power to the receiver whereby automatic and continuous reception of signals from an object within the multiple beam pattern is accomplished. In addition, the invention relates to coherent summing of various combinations of the feed port outputs to provide a variable beam width pattern.