It's not very clear, they appear to be bog standard steel to me from all the pics I've seen. But then it's very difficult to judge on looks alone. Can any owners confirm material and length (from lower circlip groove to the end of the thread)?
I've not installed, or even used, it yet, but I have a Futaba 2.4GHz system for my 3VCS. The receiver has no external aerial wire at all, just a small 'nodule' on its upper surface. Very cool!
