There are threads on this, just do a search.
Essentially a handheld CB will let you talk to the Jeep in front of you and behind you on the trail. You might be able to reach out a mile or so if standing outside the Jeep. You can get a handheld unit for a little over a hundred dollars.
Search the electronics forum for threads on mounted units. Antennas, SWR meters, etc..
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