My brother had one of these, and the same thing happened to his. A small plastic gear fails for what ever reason. It does require a return to the factory. In my brother's case, they fixed it free although the antenna was over a year old. It's worth a try.
Or, you could save your money and purchase a HiQ or Tarheel, and improve your signal by a couple of S units.
Alan, KØBG
www.k0bg.com