“[Radio-Locator.com] is a search engine for finding radio stations in the United States and all around the world. We provide technical information, including coverage maps, for all U.S. licensed radio stations and most Canadian and Mexican stations as well. We provide links to over 15,100 radio stations’ websites, and over 9900 stations’ live Internet audio streams.”
If you’re into Old-Time Radio, check out The Antioch Broadcasting Network (ABN), and/or the Internet Archive. IA does TV, too.