I thought about the fact that the dish is essentially a parabolic reflector, and one that's large enough to pull in small sounds pretty well, but he'd only hear such a reflected sound when standing in one specific spot.
Oh ! that would be against law of physics - just find local focal point for the antenna ... it's LNBF; now draw outbound energy [sound's wave for the sake] - to which direction these would go ? not counting size of sound's wave and the reflector size ...
it would be out of common knowledge too
Edited by P Smith, 19 March 2014 - 01:05 PM.