here's another one
I've got a couple of the valor's. They work pretty good. In my quest for the "perfect" mobile antenna. I ran across these.
http://www.cellantenna.com/Antennas/magneticmount.htm
The cable is rg-58 size, they have a larger mag. base than the valor. I went with the kit with all the different styles included ($50) kit because I didn't know which one would work the best for the systems I monitor.
The one similar to the valor style (ca-12m) seems to work the best for me. I'm scanning 800 trunked and conventional 150's. The little ca04m also does surprisingly well.
You will have to replace the connector with a BNC. I couldn't find an adapter to fit the one that comes on it.
Also, I can't remember if it was on the valor or the one mentioned above (maybe both), I was able to tune the antenna for a little better performance by stretching the coils a little. I didn't have all the correct test equipment handy so, i just made due with what i had.
I put the scanner on hold on a 800mhz trunked site control channel that was far enough away to give me a lower signal strength(1-2 bars). I then played around with stretching the coils apart a little at a time until I got the most signal strength. It doesn't take much. I played around until I was able to get good signal strength balance between the 800 system and the NOAA wx channels. I chose the NOAA wx because those freq's are always transmitting and fairly close to the 150mhz band.