"Bob Bob" wrote in message
...
Hi All

I will be moving to a house early next year that has 90ft trees scattered
around the backyard. Rather than setup a tower (initially anyway) I am
looking at hanging a wire (1/2" braid) 2 metre collinear for a rope
between the trees and feeding it from the bottom end.

Firstly talking about phasing sections. Has anyone come accross the
maths/size of using a single turn of stiff wire (looks like a ring match)
to go between the elements? Was thinking a short length of PVC pipe with
dowel or fibreglass spacers. How big?

What is the general figure of merit for shortening the topmost element by
when joined to a (say) PVC insulator.

And feeding. Was thinking about the J pole type match - The two parallel
wires 1/4 wavelenth long and a direct coax feed a few inches from the
bottom. Are there any better end/voltage fed methods?

Any thoughts or other construction methods/ideas appreciated.

Cheers Bob VK2YQA

Bob,

I don't know about the 5/8, but you are basically on the right track. I once
bought an Andrew 1900 MHz vertical that claimed 8 or 10 dbi gain, non
directional. It had multiple radiators stacked vertically inside a plastic
tube about 1/2 inch OD, couple of feet tall. No idea how it was phased
internally, but don't think it had any coils in there. I had it mounted via
an N connector on top of a metal box, but don't think it required a ground
plane.

Tam/WB2TT