Welcome to the happiest group of van owners around. Do you have the base radio or the U-connect? My PM has the U-connect and AM reception is always nice and clear. I know how annoying that can be though. My 2010 Sprinter at work does this. Some days it will be perfectly clear and other days it's static every time you hit a pothole or the wind blows the antenna.
I really should update my pics. That one was taken about a week after I picked it up. Since then: Carpeted the floor, built a platform / storage shelf crosswise in the forward cargo area for my mattress and sleeping bag, and done some organizing so that there is a place for everything that has to come with me.