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A Question Concerning Feed Blockage

The simplified method of calculating feed blockage loss for a center 
feed dish is to subtract the area of the feed and support struts from 
the dish aperture and use the resultant aperture to calculate gain. I 
believe this calculation is valid for a uniformly illuminated dish 
but would not be valid for dishes with cosine, gaussian or other 
aperture distributions. If my assumption is correct, can anyone 
provide a formula to calculate feed blockage for dish with a 15 dB 
edge taper?

Thanks in advance,

Gene Marcus W3PM GM4YRE
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