Thanks for the help! Gonna place an order. Already ordered the lod cb mount for my incoming tire carrier but I'll just return that one insteadHi m3lover1 - there really is no such thing as a pre-tuned antenna... don't let anyone tell you differently! (There's a lot of good technical information on the FireStik website for anyone that is interested.) ALL of the antennas we carry are Firestik's with tune-able tips.
Generally speaking, the longer (higher) a CB antenna is, the better it will perform - so I guess I'd recommend the 4'.
Below is a link to the post of my build. The mount and location I used works for any NMO mounted antenna. Then just get whatever GMRS antenna you want that has that connection. The antenna I use would work for that, for example. Very inexpensive as well. It is pretty much the best location on a Wrangler for an antenna. Unless building something else custom.I have a GMRS radio not CB so I don't have that problem I wish people would make a decent. mount for those