I discovered Limbaugh in 1992 or 93 because at the time, he was on a shortwave station: WRNO in New Orleans. I was living in northern Ontario at the time and it was impossible to receive American radio on AM or FM.
These days when I want to listen in, I do it via the Net, of course, but my Grundig YB-400 is still sitting on my desk.
Always figured Rush noodled with the idea, but he landed on AM.