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Per 2008 NEC Art 810, a #10 copper wire (or permissible alternative) should be run from the mast in as straight a run as practical to the home's ground electrode system (GES). A separate permissible ground wire should be run from a coaxial mounting block (located at or near the cable's point of entry) to the same GES. Connecting to your solar array does not satisfy code requirements.
That said, I'd have to guess that 95+% of our customers never ground their outdoor antennas despite our recommendation that they do so....
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