Weird radio thing on old bombcast episode? (solved)

Anyone remember what old radio recording they played on the Bombcast several years back? I want to say it was part of their ham radio bits, but I could be wrong. They would play some frequency and it would make weird noises, nothing that was much of a tune. If anyone remembers what this was, or has a link to a recording of it, that'd be cool

https://en.wikipedia.org/wiki/UVB-76

Thanks!