As well as the height danger is it even safe to be that close to something transmitting powerful radio waves? I remember reading on the 28 days later forum about a couple of people who climbed the Belmont transmitter in Lincolnshire without permission. The general view was that they were both going to die a horrible death from cancer due to absorbing the death rays
THat is definitely daft. I might have had a wee go as a 13 or 14 year old as my mates and I used to do some silly stuff on bridges but nowhere near that height, I would be worried about wind shear that high up!