Just a bit of different perspective on this query. About 10 years ago, my uncle leased a cattle farm with a small farmhouse. I lived there rent-free for taking care of the cows. Great deal for an 18 year old. Anyways, got D*, and the tech came out and mounted the dish to a big tree close to the house. I didn't think anything of it and it worked, so that's all I cared about. Well, about 3 months later, I woke up with no D* service. After I realized there was 0 signal getting to the box, I went out and found the arm of the dish broken off and hanging from the cable. Turned out, the cows came up and scratched their heads and necks against the satellite dish and one of them ended up breaking it. So, I can't speak for tree growth or wind, but cows can definitely mess up a tree mounted dish!