Even if the horizontal position of the arm says there is only one tree there, the Arm is NOT lined up with what the dish sees, if you have a muti LNB dish. You'll cut down a pertectly innocent tree. You'd be suprised what a 6 inch rise in the dish mounting would do. That should be much easier than cutting down tree after tree until you find the correct one. There are all sort of angles involed that you need an accurate line of site siteing and that is whre the tech comes in. He knows the compass offsets that also come into play. For all the time spent here, you could have it done.