I used the crimp type mount. I did scrap and sand off some of the paint on the underside of the roof rack, until i got a perfect reading from my VOM (from the antenna mount to the chassis). I also scraped off some paint and rubber between the roof rack and the first mouting bolt on the rack. Don't know that I needed too, but the grounding of the mount is the most important part of the antenna.
I added the foldover mount on that, which I found at the CB shop. I did find it on line at:
http://www.palcoelectronics.com/p1003315.htm It is a 203EZ from Valor. I considered the firestik folding mount
http://www.firestik.com/Catalog/dv90.htm but the Valor looked cleaner without the wingnut.
On the trail and around town i just leave it down and i get great reception, but only shorter trasnmit range. On the open highway, i'll put it up. So far I have not tested the actual range. But i have not yet asked for a channel 19 "i need me a radio check", without a solid "It's a working driver" reply. I need to get out of town to get some mile marker referances.
As far as glass mount:
I had one on my chevy dually when the kids were on the hores show circuit. I thought it worked great. But I was having doubts, so I got a roof top perminate antenna. I found out that the reception was the same. But the glass mount gave my about 20% of the transmit range of the roof top mount. I spent a lot of time hauling the goosneck with horses between Texas, oklahoma, Indiana, Kentucky, Wisconsin, Tennesse and Kansas to learn how differance there was in transmit range is on the open highway. Comments from firestik:
http://www.firestik.com/Tech_Docs/on-glass.htm comments from Alf:
http://www.alfenterprises.com/MobileCBAntennas.html A glass mount can loose upto 3db (on the log scale). That is 1000 times less transmit power.
SIG/Sauer collector with Pewter LUX, Air suspension package, GPS, Cobra75wxst CB, UnidenBC245XLT, Valentine One.