I bought a telescoping flag pole kit from Harbor Freight and am using it for a small anemometer. The kit comes with a piece of schedule 40 PVC pipe that the pole slides into. I'd like to mount this on my roof, re-using some supports from an old satellite dish. I plan to angle cut the pipe to the roof angle but also need some sort of flange that the pipe will actually sit in, then I'll clamp it down to the satellite mounts. Most roof mount flanges I find are pretty piddly and only meant for exhaust ductwork and such. Can someone recommend a flange for roof mounting stuff that's pretty heavy duty?
edit: Photo of the current satellite mount. My idea is for the schedule 40 PVC to go right alongside the main satellite mount, attaching to the roof, and then I'll attach the top of the PVC to the top of the satellite mount so it's attached in two places.