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Do you need to ground an antenna in the attic.
In the case of an attic installation your tv antenna will be sheltered from the environment so there s no need to ground it for that reason.
Agreeing with adtech i don t see the nec requiring you to ground an indoor antenna system.
But if you have access to a ground connection that can serve the attic splitter it makes sense to use it.
However the connection of your antenna coax to various ac operated equipment in this case your converter box or tv introduces the potential of electric shock.
Antennas mine are receive only for fm tv and public safety bands will be generally restricted to the attic.