HD-Radio technology allows radio stations to send multiple programs simultaneously, known as multi-casting, to a radio designed to receive digital signals. For more information on HD-Radio technology,WRVO-Extra is a multi-cast station available only to those who have an HD-Radio. If you don't have a HD-Radio, don't worry you don't need to feel left out. WRVO-Extra is available online just like WRVO. So, wherever you have an internet connection, you can listen to WRVO-Extra.