The new head unit I had put in works great on FM - nothing but static on AM. (Even when the engine is off). Someone suggested that the S2000 uses a powered antenna that may be disconnected.

1) Anyone know if the S2K uses a powered antenna?

2) Anyone know where it gets its power?

 

It does have an amplified antenna. However if you are getting FM reception the problem probably does not lie with the antenna. Could be a head unit problem.