Try disconnecting the battery for about 10 minutes or have vehicle scanned to determine problem and have codes cleared
Jeep does not use inertia/reset switches.
When all else fails, disconnect the battery and reconect it.
You can buy aftermarket antennas at most auto stores (i.e. O'reillys, Autozone, etc) They will come with adaptors. Simple installation, takes 5 minutes or less.
3 years, 36000 miles from initial purchase date.