I'm also glad to hear about the chain link fence, because I mentioned losing control with our chain link. I got control back and everything was OK, but on RCU people said they had not experienced that and it must have been something else. Now I believe it can happen, but with all the variables, no one can predict where and when.
We have a small metal roof at our field (radio impound) and I advised people that we had enough metal, than you very much. They thought I was crazy, but it sounds like a club shouldn't get too carried away with metal installations at the field.