I just bought a Dodge Caravan with a Pioneer DEH-P2000 radio/CD player. When
listening to AM radio and driving near HV powerlines, the received signal is
significantly distorted. The sound "warbles", and is very unpleasant, and
sometimes hard to understand voices. It happens a lot driving around town.

I've never experienced this before with other cars or radios. Can anyone suggest
anything I can do to solve the problem, other than the obvious "replace it"?