I listened, rather briefly, too. I heard nothing unusual.
I did see two bars of the spectrum flashing, which makes me think that you might be dealing with some type of 60 Hertz hum, from a grounding issue.
Generic radio geek, in southeast Michigan.
PSR-500, TM-742, TM-V71,TH-78, HTX-420, IC-2AT, IC-2E (clone), Pro-39, BC-235XLT, TK-290, XTS-5000