I am using 2 1/2 inch pvc clamped to the side of the garage. This is just to get up and running. The clamps allow me to pull the pole down for easier service. Roof mount is out because of getting a new roof this spring. Also my neighborhood is trying to be part of a "hysterical" (historical) district and the tripod mount on the roof would not look good. The u-bolts fit around the 2 1/2" pvc pipe just fine. Tested the pole and get no sway at the top. The pipe is 12' . I went with PVC because I didn't want to set up a nice lightning rod (hmmm now there is a thought) next to the old garage. I am going to set up a separate mount later this summer when I can get an idea of the best spot to place the ISS. I also am working on getting a PTZ weather cam and I want it all on the same pole.