The only thing bad about AC on a metal tower is that you have to hold onto that tower. And if the something goes wrong is could be a very shocking experience! DC power is bad enought.
I have been on the 300' tower in the rain as I watched lightning in the distance. And let me tell me that getting a jolt from DC about that time will make you shit you pants.
LOL, NO! I didn't make pudding in my pants! But if I had eaten lunch I may have!