Enlarge (credit: Getty Images) The fight over the future of AM radio got a little more heated this week as organizations representing the auto and technology industries told Congress that its plan to mandate this mode of radio wave reception is poorly conceived and will hinder progress. AM radio has seen almost every other in-car entertainment option come and go—vinyl, 8-tracks, cassettes, CDs—and it might predate just about everything other than playing "I Spy," but time is catching up with this old broadcast technology.