I've got a similar plan. My HAM will be mounted in the vehicle with a dedicated antenna and will be my primary comms method. I'll have a second antenna cable run that I can switch antenna/handheld radio back and forth between GMRS/CB as needed based on the group I'm running with.I plan on running both GMRS (Midland MXT275) and CB (Midland 75-822) that can one, or both tuck out of the way in the center console when not in use. I know CB is dying, but still too many of them out there not to have one.
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