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Message: <blockquote data-quote="spiney" data-source="post: 232643" data-attributes="member: 192438">What I said was, for wavelengths bigger than holes, the field only exists a short distance behind the holes - unless you deliberately extract energy - hence what you get is reflection, but it's not perfect, a solid dish is slightly better.You can't "fill in the holes"! What you'd have to do is create a new solid continuous conductive surface with no rf impedence mismatches.  There's no practical method of doing this at all, never mind as a DIY job.</blockquote>