While this is a bit OT, since we've diverged into grounding, I want to add another reason grounding is important. One time I had Ironwood do an install, I got the local supervisor and we had a blast swapping wiring stories, tricks, etc. (He now sends his newbies to my house to see how things should be done right...)
One thing he taught me is that dish grounding is very important, even if the dish is below the eaves and not subject to lightning strikes. Wind across the dish will build up a static charge (and remember, the new dishes are bigger surfaces) that can cause problems to a system--and at unexpected times when there isn't a storm anywhere in the area. So, I now ground my dish everytime and he instructs all his installers to as well. (Tho, I have seen one who was in too big of a hurry and forgot the master's instruction...)
Cheers,
Tom