CB Antenna cable too short

Got the Firefly 18ft cable and not was it will reach the CB over the rear mirror at 18ft.

I saw some threads suggesting using the roll bar route but with the Hardtop on, I can feed it that way. Also really hard to find longer wires. so Got two smaller ones and will use and adapter to connect them.

Sucks after removing the spare and TF HD carrier and start running the wire to realize it short. Also the FF wire comes with a bare end and have to solder tip on. Never done that and can'[t fine my solder gun anyways.