I'd like to mount an antenna mast to the gable end of my house. I was planning for the mast to extend from ~10 feet above the roofline down to the ground. I've seen wall mounts specifically for masts, but they seem kind of expensive ($62 for 2?). Also, they seem to be for mounting the mast outside the eave.
I've noticed that electrical weatherheads are installed differently when they're on the gable end: The conduit is mounted to the exterior wall with brackets that don't leave a gap between the conduit and the wall. Then the conduit passes through a hole in the eave (through a pipe flashing boot). Is there any reason not to do the same with my antenna mast (besides the obvious nuisance of having to drill a hole and do some roofing repair)?
Is the gap from the side of the house to protect the house from lightning strikes? If so, why don't service entrance masts employ the same protection?