I tried to post a mention of a very odd feedline called the "G-line"
Two attempts and google ate both of them.

It is a true single conductor UHF feedline.
It isn't perfect, but has a low loss.
It "leaks" and in some situaiton that is a benifit.

See:
http://w5jgv.com/1970_tower/tower.htm
http://www.broadcast.net/pipermail/radio-tech/2004-February/049867.html

I have used the damn things, they can't work, but they do.
They work very well.
I still don't believe in them.
But since they do appear to work I will pretend to believe in them.

Before flaming me, so some net research.
+"G-line" +"antenna"

Terry