There are very specific requirements for grounding an antenna both via mast ground and a shield ground.
How to ground antenna attic.
Just use a worm gear clamp around the mast and the vent pipes.
If you need to bend the ground wire make the bends as gradual and as smooth as possible.
Neither apply to an antenna in the attic.
Note that you do not have to run the ground wire from the antenna you can ground the boom to the coax using a grounding block and at the other end run a ground block and grounding wire to the main ground.
Most antennas designed for outdoor or attic installations come with some mounting hardware.
From your description it sounds as if you may create a ground loop which may cause problems throughout the house.
Try to keep your ground wire runs as short as possible and avoid making 90 degree turns or bends.
Run a ground wire from it common ground rod where the electricity enters your house.
You have to inspect it along its full length until you reach a working ground wire.
So there isn t any ground from the tv either to bleed off any voltage that might pass through the antenna.
It doesn t support what you want to do.
Securely fasten the grounding wire to the side of your house using staples or other zip screw type wire clamp suitable for the job.
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.
You may still need to visit your local hardware store or buy some online.
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.
I ve installed two roof antennas and grounded them by connecting a heavy gauge wire form the base of the antenna to the copper vent pipes that run through the attic from the plumbing system.
I ended up buying the channel master 3078 roof attic mount antenna mount kit and then i attached it to a small wood pole.
Stick to the building code.
You can use the outside of the electrical conduit provided the conduit has a continuous reliable electrical connection to earth ground.
