Tom The Rohn 25 is not designed to be a freestanding tower, especially at 40 feet with a 2 el quad on top. Normal base for a GUYED Rohn 25 tower is 2.8 by 3 by 3 ft. I would not want to climb that 40 feet of freestanding 25 with a quad on top, much less be under it at 50-60 MPH winds. Bill KH7XS/K4XS