Its bound to block some, but there are so many FTA channels that its still worth it, even if you only got a few satellites, (IMO) If you have a digital camera post a picture of you line of sight to the satellites (In thumbnail)
Here is the line of site where I wanted to hook up the satellite. The tree to the left is in the SE part of the yard and the tree to the right is in my neighbors yard toward the SE. The trees in the distance are across a park entrance road about 100 yard away or so. Will this work or am I going to have to put the dish in the SE corner of the fence where it will have a clear view of everything. The only problem with that figuring out how to run the wire a long distance.
I'm trying to post the picture,but it says I can't until I have 5 or more posts. I can e-mail to anybody that would like to see it.
My advice would be to get the pointing data from Satfinder (free download or ask PSB ). Then get a compass and see what satellites you can get from that location. As PSB said, closer to the corner would be better. I don't think the distant trees would bother you.