How much difference between SD and HD

Well, we had a dish installer out and using the numbers the receiver gave us, nothing happened. This is getting entirely too complicated at this point especially since I don't know how we'd tell whether the skew was off in addition to the azimuth. The only sure thing we knew was that the post was plumb and level! I'm going to see if we can get out of this contract and switch to Dish since DirecTV won't come help us out.