I still remember a demonstration of transmission line phenomena given by
Dick Silberstein, W0YBF, at the Denver Radio Club more than 30 years
ago. He had made a "slotted line" (more accurately a trough line) from a
wire tightly suspended in the "V" of a piece of angle aluminum or steel.
It worked very well. It was pretty large -- I believe the frequency he
used was around 50 MHz. You could use a smaller piece of angle material
or suspend it deeper in the valley for a higher frequency.

Roy Lewallen, W7EL

Jerry Martes wrote:

Cecil

I've always ignored the use of twin lead for impedance measurement. But,
it makes sense. I may try building something like that, just for fun.

I certainly havent thought this "twin lead" line thru but it seems that
one could be easily built from a length of PVC pipe with wires attached to
its sides.
This seems too easy and relatively accurate for "home in the garage" use.
I'd bet I can find some info on the Internet for FM and TV frequency use.
Thanks for jogging my mind.

Jerry