First of all, what kind of truck is it? I've never had a single antenna setup to work right either. I've run dual antennas on most of my trucks and those work decently. Wilson 2000's are good (but they're about 5' tall), and Firestick II's and Wilson fibreglass antennas are good and can be had in 3' and 4' lengths. For dual antenna installs, get a co-phase harness. Adjust the SWR on each antenna using a regular, 50-ohm coax, then hook up the co-phase harness.
The reason that a single antenna doesn't work well on a big truck is that the shape of a truck and the location of the antenna tend to distort the radiation pattern. Dual antennas even this out. Keep us posted, and good luck on the new setup.
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