Audio Systems: Static in my car stereo, honda civic lx, element antenna

Question
I have a 2003 Honda Civic LX 2dr and I had a Pioneer stereo installed back at the beginning of the year.  As you know, these Civics do not have an external antenna.  I think they are built into the rear window.  I do have black tint on the back as well.  When I turn on the rear defroster, I get static and when I turn it off it goes away.  I also have less static a lot when the heater isn't on.  The stereo was installed by circuit city so I am sure they installed it correctly.  There wasn't any problems with it after they installed it until now. I read somewhere it could be my coil in my defroster.  All I know is, there is static and what do I need to do to eliminate it?  Is there antenna I can by to boost the signal.  Any input would be greatly appreciated.  Thanks

Answer
Hi Kyle,
I wouldn't be surprised if it was the black box that connects the antenna to the heated rear window element / antenna.
I usually spend $25 and get an electric antenna to put on the fender (wing) and forget the built in one, much better all round, Peter