This definitely I sounds like a number station, like someone else mention earlier. I really get a kick out of this stuff. Here is a link for anyone else interested in hearing other number stations. http://archive.org/details/ird059 The way I see it, this seems like the radio would be one way to give context to the game. Almost like flavor text for those who search for it. I remember reading an interview with Rocket (I think the pcgamer interview) where he wants to add this sort of stuff to the game. It'd be interesting to find notes/journals and other things that give clues to the outbreak. But that's just my two cents.