Ok heres my two cents. May be a bit off subject but I used to fly a small electric plane in the middle of 4 soccer fields that were seperated by outdoor statium lighting, so if you can picture 4 fields seperated into 4 rectangles by the rows of light poles that was the setup. I crashed into the very very top of one of the poles one day which sent my plane to the ground and in need of a new wing. While driving to the hobby store to get another foam wing I devised my plan to deal with the light poles and it went like this. No matter where I am or where my plane is as long as I can see sky between the top of the pole and my bird I will always clear no matter where the plane is in relation to the pole. I had a hell of a time with the depth perception at first so this simple rule will always keep you out of trouble with verticle obstacles such as a light pole or tree. Just my two cents hope it helps. Then again why was I flying around stadium lighting in the first place hehe

Zachary Kirby
LTJG USN