To replace a Liberty radio antenna will require an adaptor. Part # #6201 a/k/a hummer adaptor

I found it here "Speed and Truck World Estore Your Parts Source"
#6201 and it is same as Hummer, we got them in stock now. There about $4.00 plus shipping and handling.
I suggest ordering 2 at a time.

http://www.speedandtruckworld.com/estore/

these folks are also a good source for other parts. Shop is located in Fort Lauderdale Florida

Oh don't put on that shorty antenna, they have poor reception.
Get the 31 inch Black antenna replacement from Autozone. It has the wire wrap on it. Works as good as the OEM but looks much better.

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It's not a car
It's not an SUV
It's not a truck
It's a JEEP!

I bought an aluminum shorty antenna and adapter from 4west in California and it has not affected my reception at all. I would, however, recommend to stay away from those flexible shorty's. My friend had one years ago and could barely get reception even when passing the local radio's transmission tower.

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