Originally Posted by SVTarHeel
The sad part is that, apart from those two items (which are the ones I'm most concerned with), getting the antenna in the rafters is more difficult than mounting it. Even though there's an existing mast on the chimney, I'm rethinking that option. I'm wondering if I'd be better off sacrificing some height - by mounting on the side of the roof where the dish sits - both to take advantage of the wiring there (from the old cable box) and the power meter right beside it.
It isn't awful grounding an antenna, but doing it right isn't done often. From everything I have read, it must go straight from the mast into the ground, no sharp bends, unlike what you see for most people where it bends every which way to not look awful. But lightning doesn't travel like a crazy straw - it jumped miles in the air, it finds the easiest way to ground and you are doing your best to encourage it into the ground cable to put it where you want... From there it needs to be tied to the utility ground so everything is at the same potential - now you can use the same ground rod, but that might not be convenient. The reasoning is it is the voltage differential that causes the issues, so if everything is at the same level, nothing happens.
You will hear people argue that the grounds should be separate, but according to the NEC code, and any instructional manual you have, you will see that the grounds all are supposed to tie to the service ground, even if that means running a thick cable (or large copper foil) all the way across your house.
Grounding the coax is also a good idea - the grounding blocks are cheap, and you probably already have one left over from the satellite if they did the job correctly. Same thing, needs to be tied to the service ground.
With my tower, I ran six ground rods, large copper foil underground connecting them all, as well as heavy duty 2g wire connecting the legs to the rods... it wasn't expensive, but it did take effort to do it right. We had a lightning hit twenty feet away from the tower, nothing in the house was touched except two light switches that had relays in them that were fried. All electronics in and out were fine.