I have searched the internet for this model. I have also searched the Sams Photofact guide for this model and the Radio Shack website. There is no such model anywhere. Does anyone know what Radio Shack catalog it was in, so I could at least look at a description of it? (a photo scan). It is an AM-FM-FM Stereo - FM Sub Channel (Sub-Carrier?) tuner. It has a Dimension control. Does this mean it can recieve the old sub-carrier background music stations. Do any of these sub carrier stations exist today or has the HD Radio made the FM sub-carrier obsolete?