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Message: <blockquote data-quote="moonbase" data-source="post: 757163" data-attributes="member: 178786">Channel Hopper,Thanks for the detailed reply.Logic is telling me that the signal is reflected from the surface of the dish towards the focal point at which the LNB feedhorn is located and that the amount of signal reflected is dependent on the surface area available to reflect. Hovever, as the parabolic profile for a prime focus dish is a direct mathematical derivative of the two dimensional aperture then I suppose that for any two dimensional circular window of surface area there is always the same fixed amount of reflector surface notwithstanding rimming loss and shadow loss, interesting concept nonetheless.Rgds</blockquote>