Sorry, I didn't give many details. My idea was basically for a
commercial band antenna that needs to cover a fairly wide range in the
5xx-4xx bands. I've had good performance using fairly large tubing for
wide bandwidth requirements on single element designs in the past, but
I've never attempted a multi element design using the same materials.
Lets say I'd be using 1 1/2" .065 aluminum tube. Testing would be
required to find the ideal length. Yes, I'm basically trying to see if
something along the lines of the web page plans posted above could be
utilized with a larger size tube. I just wasn't sure about how it
could be wired up. But looking at those plans, I think I see the way
it could be done. It would just take a lot of experimenting to get the
dimensions right.

Dave