Connecting aux devices to 2002 Monsoon?

Hi All: Is there any way to connect an external device to a 2002 Monsoon radio?
 
I know there's a connector in the trunk for a 6-disc changer, but I want to connect either an mp3 player or satellite radio without having to use an FM transmitter. In NY, there's so many stations, I can never get a clear FM signal.