K40 also makes good antennas. The K40, is equivilent of the Wilson 1000, minus the 1000's power capabilities.. The K40, will handle around 400 watts PEP, and the Wilson 1000 handles 1000 PEP. PEP is Peak Envelope Power. Any antenna with a loading coil, has a power rating. If you're going to run LOTS of power, go with a 102" whip. They have no coil, and you can run unlimited power.
102" whips are 1/4 wavelength. A full wavelength CB antenna would be 36 ft long! Put that on your bumper!
But in all honesty, if you want to talk good around town, go with a Little Wil'. Any magnet mt antenna should be placed in the CENTER of the cab, on top. Now, it don't have to be, but for good performance, and ease of tuning, that's where it should go.
Wilson & K40 also make tunable, yes you heard me TUNABLE "firestik" type antennas. Most guys put these on thier bumper, or up next to the cab. Next to the cab, you're going to have SWR issues. There's a guy on the site somewhere that makes custom CB antenna brackets that go beside the tailgate, and will get your antenna up above the metal.
Like I said, if you want to talk good, go to your local truck stop, and pick up a Wilson "Little Wil" and a good radio. Tune out the SWR, and keep the air hot!
Go here: www.copper.com
I have dealt with Copper before. They are in Louisville, KY. Good service, and the techs there can also tune up your radio for a fee.. and unlike some truck stop CB shops, these guys actually KNOW WHAT THEY'RE DOING..