In a message dated 7/28/2006 2:34:18 P.M. Greenwich Standard Time, crawfish at surfmore.net writes: Most definitely Rohn 25 at the base. The 20 is thinner and needs to be on top(if you HAVE to use it at all). ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ and Rohn 20 is NOT designed to be GUYED tower. Bill K4XS