Previous response was a good one, yes, moving a dish sometimes as little as several feet makes a difference. And, the dish does not point at the satellite directly, it's actually about 15 degrees lower than the satellite is.
I had some high trees and high bushes that I was certain would block the satellite view, but after moving the dishes to at least a dozen different places I found the best spots. Some of the high trees actually did not block the path, as the sats were much higher in the sky than I perceived.
Of course if you have a motorized system and want to receive many satellites, the
installation gets more complicated. Sometimes you may get most, but not all the sats you want. Then it's time to move the dish around. If you have a tripod, you can temporarily anchor the setup and check different areas. Took me about 2 - 3 months to get my expectations satisfied, and am still looking for that perfect spot, ha ha.
Sponge.