Here's a nice example: DivShare File - AM_Clip.wav
...and again with the volume adjusted: DivShare File - AM_clip2.wav
I cranked the volume at the end of clip 2 as the music fades out so you can hear the other station bleeding in. It's almost inaudible otherwise. I only heard it with headphones on initially. Our ears filter out the noise otherwise. I glean two things from this lesson:
1. I have very mixed feelings in the debate about 10Khz AM bandwidth Vs. 6 Khz... knowing how much noise is there already I think reducing the quality is probably a bad idea.
2. I also have very mixed feelings about the future of AM radio in terms of the audio quality I've come to expect from other media.