Depends on the antenna, but most of the factory style antenna's are not adjustable. A typical CB antenna that has a removable whip sticking out of a base assembly can be adjusted by lengthening or shortening the length of the whip. You also need a good, accurate, SWR meter for this to work properly. Most off the shelf SWR meters aren't accurate enough for this exercise. Some aftermarket CB antenna's have an adjustment screw. But as mentioned most likely your factory antenna doesn't adjust.
I'm not sure which of the two you mention are which. My '04 Pace Arrow didn't come with a CB antenna.
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Bob 2006 Monaco Camelot 40PDQ
US Navy Carrier Battlegroup 1959/1965
Winters in Florida, Summers in Blue Ridge Mountains
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