TV Antenna Rotors will support Small, Medium and Large Size High Gain Antennas as well as Small HAM Radio Antennas. It is Important that the Mast and Mounting Fixtures are Securely fastened to a "Fixed", Sound Structure with Corrosive Resistant Hardware, Grounded as per Applicable Code, with the Antenna Weight evenly Distributed. Please do not attempt to Force a "Fit" with this hardware as you may Compromise Integrity and Longevity. I always leave myself plenty of room for rotation clear of obstacles, structures and hazards. Please take the time to plan your Installation to avoid these pitfalls as mauch as you can. Reasearch and follow any applicable Local Building Codes (as some of these antennas can Fly, given the right Wind!) These Mounts and Masts come in Standard sizes for Interoperability with the Antenna you may select, and Options are available in Sizing for Specific Aplications... Most Antennas will Operate Perfectly with any Mast and Mounting Scenario as long as the Physical Installation is Sound. A Variety of Weather-Proofing and Hardware is Available here at 3StarInc.com to Guarantee You have what you need for Industrial Grade, Professional Quality Installation with the very same Brand Name Products that are Industry Standards.