It depends on what you expect to get from the antenna and how you plan to use it. Choosing antennas is a process of compromise. The best antenna for maximum efficiency would be a 102" stiff tube on the roof that will not bend while traveling down the highway at 80 MPH. Under the antenna would be another 102" tube straight down. Every other antenna is a compromise.
A 36" antenna is less efficient, but more practical. It can be mounted on a mirror and you should be able to communicate on Chan 19 for 5 miles and on open channel for 10 miles, depending alot on what the other station has for an antenna.
The best practical antenna for CB is a 102" whip mounted to the rear bumper, if you have a fiberglass unit. If you have an aluminum frame camper, keep the antenna away as far as possible from vertical frame members. If possible, secure the top of the antenna to keep it from bending while driving down the road.
No matter what antenna you use, grounding is important. The "ground plane" is the other half of the antenna. Also, be sure to test and adjust your SWR. Too high of SWR may reduce your radio's power output or damage your radio's transmitter.
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