If it was me, I'd get a 10' electrical conduit pipe, insert it into the end of the pipe that is holding the satellite, re-enforce the 10' conduit pipe where the wood trim is along the roof rafter by attaching a bracket for extra stability.
I would think you'd be pulling in signals from 50-70 miles away depending on the terrain.
I have my ST-2 mounted on a 10' conduit pipe to a satellite pipe, the conduit pipe slid right in like it was made for it! Now granted, I have the satellite pipe attached to my chimney by chimney mount brackets so my antenna is 12' above the peak of my metal roof.
Like others have said.....the higher, the better!