So this is what I have been using for a few years now after trying every other kind of extendable pole that I could find!
These are the poles the Utility Crews use on live powerlines to reset wires and circuit breakers on the line so I figure they are perfect for Antenna Masts in almost any setting.
We have stuck 20' Diamond Vertical on them along with 70cm Yagis at the same time and when guyed properly it is amazing really how strong they are.
All sections lock positively in extension and you can clamp directly the any section really without crushing them!
OK I can not get a pic in here?
Hastings Hot Stick is what I am talking about.
And I have paid $100 for 35' models too.