There are many dual band mobile antennas made for 2 meters and 70cm. The first thing to do would search out where the antenna would be mounted and whether there is a suitable ground plane. A buddy of mine mounted a CB antenna to the spare tire mount and a 2m/70cm antenna to an off-road light mount at the lower driver's side of the windshield. With the amount of plastic in Jeep Wrangler construction, a half-wave antenna (which doesn't require a ground plane) is one possible choice. If you're in a Jeep club, ask the other members what they use.