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It doesn't seem to be done nowdays but earthing your dish can help in case of a lightning strike. Note though, that a direct hit to your LNB will more than likely fry your box(es) - not much you can do in that case except have insurance.
Earthing your box will generally do nothing and in fact can create annoying earth loops in your AV connections (produces hum in the audio and in some cases interferance lines on the video).
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