http://www.buddipole.com/lotewh.htmlI purchased this as an alternative to a long CB style wire whip. My intended application was portable HF mounted to a Wolfriver coils Silver bullet mini.
This is NOT a mobile install for a moving vehicle, rather something I can keep in a field kit.
For a telescoping antenna this is made very rugged. Don't think of the flimsy types most am/fm radios have. I opted to upgrade with a sturd aluminum knurled collar to add more support to the base.

The whole thing collapses to about 24 inches.

For resonant tuning with the coil, I typically tune towards to lower portion (digital/CW) and if I go higher towards the SSB/phone portion I just partially collapse one segment to make a shorter element.
As far as performance, since I've only used it with the silver bullet coil, I cannot really compare it to anything. I did use the reverse beacon network to view my TX on 40/30/20/17/15 meter bands. So this whip is getting my signal out well enough.
I'd you need a whip antenna for portable use, this is reasonably priced and we'll made.