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Do you need to ground an antenna in the attic.
Antennas mine are receive only for fm tv and public safety bands will be generally restricted to the attic.
Agreeing with adtech i don t see the nec requiring you to ground an indoor antenna system.
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.
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.
This isn t the ideal situation for installation of an outside antenna but sometimes it is necessary based on a number of factors.