My father in law has one at his cabin and he has to stand right underneath it in order to get coverage. But, it is better than before when he had no coverage at all.
We run them on the farm... in the shop, tractors, combines and the boss's home. They do help a lot out in the boonies. I think he paid quite a bit of money for them though. I wish I had one here at the house but I don't want to fork out the cash for a good one. Tim