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rectangular "dish" illumination?

Hi folks,

So what is the rule of thumb when illuminating a not-round "dish"?
My screen-covered grill measures about 30x36".  Do I pick a feed
with a 10db width of 30 or 36 or somwhere in between?  It will be
a compromise, but what is best?  Do I gain more signal or noise as
the pattern spills over the width, and illumiates the length?


Greg  KO6TH

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