I remember helping friends put up a 90-foot radio tower in Massachusetts, but this much shorter, much broader scaffolding didn't feel nearly as stable. Am I getting older? Could be. The fact that you could clip your safety harness to the tower easily at any level helped make that feel stable, too. And the guy wires -- I remember feeling much more nervous the few times I had to climb above the top guys. And the scaffolding wobbled.
