Firstly thanks for all the replies
But I am now more confused than ever I now know that they are part of the HF antennas but I am totally confused about it so its just the start of a long antenna that is much bigger than which is actually visable on the outside? its the moving bit that confues me, what moves ?
Funnily enough it actually turned out to be quite relevent to me as I have been using HF recently and the HF is not working very well in my aeroplane ( light twin and I know that is how most things work on them especilly the avionics ) at first I thought it was just a bad HF but it receives really quite well but no one can seem to hear me, I was told if I speak into it quiety and really softley it will work as it is over modulating ( to be honest might as well be alien talk to me but I would like to know more ) but it has seemed to resolve the problem by a small margin what do you all think.
Off topic slightly from my origin post I know but probably still relevent.any info would be great.