Scratch beneath the surface of anyone who works in radio and chances are you'll find a closet anorak lurking beneath.

Most of us developed a passion for the medium at an early age that's never completely died out.

For those of us in the UK, it was Radio Luxembourg, early Radio One or the pirates of the 1960s that first kindled our love of the wireless.

For many listeners in the US, though, it was the high-powered "border blaster" stations based in Mexico in order to evade American broadcasting regulations.

Border radio was the subject of a great interview on NPR's Fresh Air recently.

Bill Crawford, author of a book on the subject, discusses the colourful history of these renegade stations.

After listening to the interview, and the excerpts from shows by gravel-throated DJ Wolfman Jack, I immediately ordered the book.