This is off topic. I just returned from a great trip up to Cutler, Maine (thanks Jim-ME for the great advice on where to hike).

About 5 months ago I replaced my FJ's radio with a Pioneer Avic X710BT nav unit. I love everything about it with the exception of one thing - I get a lot of FM static.

What could cause this? It seems hyper-sensitve to changes in altitude (ie - I go over a hill and I get great reception, the road goes down and I get the snap-crackle-pop effect). AM is fine, as is iPod etc. Only happens in FM. I even noticed today that my winshield washer pump made it hiss on a certain station. Is this a grounding problem? My antenna is screwed on tight, and the plug is tight into the back of the radio. Thanks in advance for any help - the FJ guys weren't too helpful...