At VHF/UHF (TV bands) no, a ground connection will be fairly invisible and useless for reducing noise, but at HF it can be useful depending on the antenna type and its surroundings. There are other ways to keep noise off the coax to your TV antenna if that is really a problem.
There is no NEC grounding requirement I can find for an indoor mounted TV antenna but its not a bad idea to make sure the antenna and coax shield are at the same potential as your house ground, in case there is a problem and someone touches the antenna and something grounded in the attic at the same time.
A ground block is required for an outside antenna to comply with NEC and that's mostly for protection against electrocution as mentioned above. Grounding to code will not protect from lightning and that's not a concern with attic mounted antennas.
I suggest you do your own research on NEC grounding requirements to make sure you understand them and choose the best option.
prcguy
Does the coax cable shielding have to be grounded in order to do it's job of protecting the center conductor from interference? I can't seem to get a straight answer as to whether or not a grounding block is necessary for the shield to cancel out noise. I am installing a TV antenna in my attic and am trying to figure out if a grounding block is really necessary. I don't have any way to connect a ground block directly to the house ground rod. I would have to just run the ground wire into one of my electrical outlet boxes and splice to a ground wire.....would that work if a ground is necessary?
Thanks for any advice
