I had an issue when I transmitted my CB it would cause the check engine light to illuminate and light up the dashboard like a Christmas Tree. It would also put the JT into limp mode until it was restarted. After swapping out CB radios, moving the radio to various location within the Jeep...
I’ve got a cobra cb and a fire stick brand antenna installed on my Gladiator that works. I’d recommend Right Channel Radios. They have good information on their website on install and troubleshooting. They also offer step by step info on getting a GMRS license.