My stereo has the HD option which I got the special attena for free. I did not notice anything special about it. No extra stations or anything like that. I did have a problem where I would have it set to auto when it was on a station. So if it had HD it would switch to that. But the HD coverage was not good on some stations, so it would switch back and forth and there was a delay. So it was anoying listing to a song and it would switch formats and make the song skip around.