Antennas mine are receive only for fm tv and public safety bands will be generally restricted to the attic.
Do you need to ground an antenna in the attic.
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.
But if you have access to a ground connection that can serve the attic splitter it makes sense to use it.
This isn t the ideal situation for installation of an outside antenna but sometimes it is necessary based on a number of factors.
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If you have no access it s hard for me to tell you to go to extremes to find a way.