You should therefore strongly consider grounding your attic mounted antenna by attaching a grounding block to the coaxial cable to shunt off excessive leaked current.
Grounding an antenna in attic.
Run a length of 6 jacketed stranded ground wire from whichever you installed there directly to your bussbar.
It doesn t support what you want to do.
The mounting rod is insulated from any of the active reception parts.
Exterior antennas must have their mounting rod grounded to provide electric discharge in the event of a lightning strike or static accumulation from other causes.
Try to keep your ground wire runs as short as possible and avoid making 90 degree turns or bends.
But first check the electrical plugs of the various devices attached to the tv line.
From your description it sounds as if you may create a ground loop which may cause problems throughout the house.
There are very specific requirements for grounding an antenna both via mast ground and a shield ground.
Air movement in your attic should not pose a problem.
There is no requirement to ground an attic antenna in the national electrical code.
Neither apply to an antenna in the attic.
Stick to the building code.
Then on a separate lug on the bussbar run jacketed stranded 2 ground wire outside and straight down the side of the house to a ground rod sunk at least six feet below ground eight feet would be better.