Quote:
Originally Posted by OTAtime
For example, a case where antenna is approx 30' from earth ground rod in the attic.
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The mast would be earthed to connect electricity from the cloud harmlessly to earth. But your mast is inside the attic. There is no harmless path from a cloud to that mast.
A lightning rod, outside and above, will connect lightning harmlessly to earth. Don't earth the mast hoping lightning will blow through the roof. Earth a lightning rod so that lightning does not even strike the roof or mast.
Protection is always about the electrical path a surge (ie lightning) uses to connect to earth. If that path is a wire from a lightning rod to a better earth ground, then nothing is destroyed. What always defines protection? Not a lightning rod and not a protector. Protection is defined by the quality of its connection to earth.
If a best connection to earth is via the lightning rod, then the roof and attic mounted mast are best protected.