At least half of the dishes I installed had to go on the roof. I was in hilly Western Pennsylvania, the elevation on 119 was only 29 degrees and 24 for 129! It didn't take much tree to cause LOS issues.
I have a similar tree/elevation problem at our upstate NY cottage. The EA is an easy shot, but the only place I can get a look at the WA is in the middle of the road. Fortunately it's a very lightly traveled private road, and I have blocked it a couple of times to test spare WA LNB's.