David I'm inclined to agree with the other Gs . . . you could do this MUCH more cheaply yourself (maybe a tenth of the cost) . . . and probably make a stronger and more efficient antenna.
21ft thick-walled alloy scaffold aren't that expensive, yet are extremely strong . . . and if you see a scaffold van parked, ask the driver how much he could let you have a couple for (I think you'd be surprised!) Clamp 2 together, and add another 21ft normal thickness pole on top (obtainable from any TV aerial company). Then increase the length with a horizontal wire section, to get it resonant. Personally, I wouldn't even use the poles as the radiator . . . easier to just run a thick wire from the top to a couple of feet out from the bottom . . . if you want to increase efficiency use 6 wires in a cage. And if you do that, you could use a fibreglass top section - old Windsurfing masts are cheap as chips on eBay and VERY strong ! (I still Windsurf, so have several of these) 73 Roger G3YRO _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
