I noticed that 106.7 WLTW-HD3 is playing dead air today. The HD1 and HD2 can be heard, and there is now an option to tune to the HD3 but there's dead air. Why would a station broadcast dead air on an HD3, and does the dead air use any bandwidth that degrades the quality of the HD1 and HD2. Or, is the signal too weak for me to receive the HD3 so I hear dead air. The display says "Wltw-HD3" as the title and artist.