like rainman said, look at the s2000, if you no like, you might have to buy a new antenna and not just the motor, do you hear the motor running or no noise at all when you try to make it go up. check for any loose wires to the antenna.
I think that motor and new antenna is a pretty decent chunk of change if you want to get a new one, plus have it installed. Just get the S2000 antenna, what is it like $20 shipped? and then install it yourself. Use the rest of the money for something else on your car