ROHN FRM225 is a roof mount designed for mounting antennas on flat surfaces. It is made of 2.25" O.D. X 14GA steel tubing and has a 60.00" overall length. The FRM225 can support antennas with an effective projected area of up to 100 square feet at a wind velocity of 12 MPH. It can also support antennas with an effective projected area of up to 200 square feet at a wind velocity of 24 MPH. The FRM225 is a versatile mount that can be used for a variety of applications, including mounting antennas for telecommunications, surveillance, and weather monitoring.