snip

"Bryan" wrote in message

I'm not
sure I follow your line of thinking in regard to moving the shield
up/down.
Bryan


Perhaps I am over-analyzing it. Here's what I meant:

To make the antenna, a quarter wave section of shield is exposed, then
inverted and pulled down over the outside of the coax jacket. If it's
pulled down TIGHT, it has maximum length and minimum spacing to the part of
the shield under the jacket, hence the greatest decoupling takes place, if I
understand the principle of the antenna.

However, what I alluded to earlier was moving the end of the shield up and
down as a tuning method. I said this because another poster said you tune
the thing by changing the length of the coax section and/or the shield
section; I was looking for a non-cutting method to change the length of the
shield portion and merely pushing the end upward seemed to be viable. (I'm
sure the shield is sufficiently flexible to allow this.) If the end of the
shield is pushed upward, it shortens the shield and should shift resonance
up.

So, I imagine I can cut the shield section for slightly more than a quarter
wave, then tune it as I described. The upper section can be tuned with
dikes and/or a soldering iron, as necessary.

"Sal"