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.
Do you need to ground an antenna in the attic.
This isn t the ideal situation for installation of an outside antenna but sometimes it is necessary based on a number of factors.
But if you have access to a ground connection that can serve the attic splitter it makes sense to use it.
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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.
If you have no access it s hard for me to tell you to go to extremes to find a way.