On Thu, 20 Jul 2006 23:51:30 GMT, Shortwave Sportfishing
wrote:

8.5 db vertical? Way cool.

What are you using as a ground plane?

The whole thing is encased in fiberglass so the exact construction is
difficult to determine. There is an aluminum decoupling sleeve at the
bottom where the co-ax exits, and that is also the mounting point for
the U-bolts. I'm guessing, but suspect that inside the fiberglass are
some stacked co-linear elements, perhaps center fed but I don't know.
The frequencies are at about 2400 MHz so you can fit a lot of 1/4 wave
segments in a small space.

You can buy them at CompUSA stores:

http://tinyurl.com/s6vkg

Looks like they are now claiming 9 db gain.