I live in South Florida and I have had my Vette for almost a year now. I have noticed that when I keep the "HD" radio on that the signal fades in and out on a regular basis. At first, I attributed this to poor HD reception in my local area. Now I recently purchased a Lexus GS350 as my daily driver and the HD radio is crystal clear and NEVER fades in and out. Has anyone had this issue?? Are your HD signals strong and consistent? I just keep the HD off in the Vette, but perhaps my receiver needs to be replaced?