If you have no access it s hard for me to tell you to go to extremes to find a way.
Do you need to ground an antenna in the attic.
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But if you have access to a ground connection that can serve the attic splitter it makes sense to use it.
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.
Antennas mine are receive only for fm tv and public safety bands will be generally restricted to 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.