When HD Radio was under development and policy-discussions on the technology were in their infancy, proponents of the system bragged about all of the game-changing features it would have. This included audio quality that sounded better than CD and the ability to broadcast a plethora of digital data beyond audio itself.
They also told us that digital radio signals would be more robust and easier to receive than their analog counterparts. This was a critical assertion, because HD Radio works by shoehorning digital signals onto the existing AM and FM bands, right next to analog ones, and thus to avoid interference the HD signal can only be broadcast at just a fraction of a station’s analog power output. But proponents said that was okay: HD Radio only needed a fraction of the power to kick ass and blow minds.