The 2.375, 2.38, 2-3/8 inch Diameter Pipe size mounts HughesNet, DirecWAY and STARBAND Satellite Internet Dish Antenna, PR-TV and some SCALA UHF Antenna, Andrew, Gabriel and Blonder Tongue Microwave Parabolic Reflector Antennas. And with a little Field Drilling, Screws and Pitch Pads are available as an option for Bolt-down versus Ballast applications. The Length of the mast is 30 inches based on engineering that incorporates consideration for typical Dish Antenna Wind-load versus the Ballast that would keep either on target with minimal deviation and flex. As with all Ballast mounts, Structural Engineering consultations are recommended for all Roof Applications.