Just got a handheld dual band a couple months ago. I'm new to the dual bands. I've been researching antenas for the Jeep to connect the handheld to. The one that's gotten consistently good reviews is the Comet CA-2X4SRNMO.
https://www.amazon.com/gp/product/B0...=AWHEELI3SYPUS
Here's it's reviews on eham.net:
http://www.eham.net/reviews/detail/2082
Haven't bought it yet, so can't speak to how good it is. But I think it's the one I'll be going with.
Cable and mount: https://www.amazon.com/gp/product/B0...A1BW14T7KC6E0Q
Spring to allow the antenna to bend over: https://www.amazon.com/gp/product/B0...=AJVLD9QL76QMK