As mentioned in a previous thread, I have been having signal problems ever since my dish was swapped out for a larger 24' size. The only way I was able to get a good signal was by removing the LNB and temporarily taping it out about 2" from the arm. Today a new installer came out and replaced the entire dish. Now I get a great signal. He said the previous installer was lazy and just bolted the 24" dish onto the old arm (for the original smaller dish)--this results in an improper dish-to-LNB distance as the focal distances are different. So if you're switching to a larger dish...replace the whole antenna! Knowing this would have saved me weeks of frustration!