Originally Posted by etrin
Dave if you run the ground from the block outside your house penetration to the main ground do you also ground the antenna? If so the same ground wire?
The attic mounted antenna, I see here that it is not required but is there a reason to ground it?
To the wiring inside the house or to the the outside with a wire back to the main panel ground?
Yes and No. You ground the shield of the coax and the rotor and the mast to ground, through the coax shield *IF* you arent using a 300 to 75 ohm transformer. If you are, you need two blocks, one at the transformer and one at the ground level. The actual elements of most antennas are not at DC ground, so technically, they are not directly grounded, but the grounding block has small points inside between the center conductor (the antenna) and the shield (the ground), so any buildup on the driven elements arcs over to ground outside before damaging your equipment.
That is why I like using ground blocks rather than physically grounding the mast...although you can do both. Just so all the grounds terminate at one point at the incoming electrical ground.
Things have changed since I took my ham radio test in 1980, so if in doubt, consult the current grounding requirements on the web for your area.
No reason to ground attic antenna unless you are getting static buildup during thunderstorms. Used to be "snow" on analog tvs which would build up more and more until it almost wiped out the picture, and then would pop, and go to clear again, as the static bridged the gap between the center conductor of the coax and the shield. On digital, I would think it would cause the picture to cut out. Like anything else, 99% of the people dont need it, but if lightning hits the tree outside your house, you might wish you had it grounded