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Message: <blockquote data-quote="sycron" data-source="post: 604313" data-attributes="member: 318607">Yes. I used the parabola calculator. The focal distance is 87.5cmI am not sure if that 87.5cm should hit the white cap edge. Or should I like make the lnbf distance 86.5cm for instance. So I know that the beams actually enter the feedhorn. Or is just touching the lnbf cover alone?I am still not sure about the cold galvanize spraypaint to use as metal shield. I tried to measure resistance over the dish surface. Did not measure any conductivity. Isn't it supposed to be? I was searching on google for RF microwave shield materials. There is conductive paint for instance.</blockquote>