Audio Systems: Jeep Grand Cherokee radio problem, jeep grand cherokee, radio connector

Question
My radio have stopped working. First it was an intermittent fault but now the radio doesnt work. In the FM part the display shows "No RDS" and there is not possible to make a station search. The auto search doesn't work either.This is also valid for the AM bands.
casette and CD works fine.
I think this radio is made by Alpine but i havent found any Alpine related p/n.
can you help me?  

Answer
Sounds like an antenna fault, try plugging in another antenna, with the radio removed from the dash. Then you can see the label on the metal case, and that should have the brand of the radio. You may need to replace the entire antenna from base to radio connector to fix this problem.