HD Radio was supposed to be terrestrial radio's answer to the digital future. Better audio, extra channels, data services. Twenty-some years later, most listeners still don't know it exists, and the ones who do mostly found it by accident in a rental car.

I go through the history: what was promised, why adoption stalled, what the internet did to the whole plan, and where AM-HD fits in. There's a real engineering story here, and a business story about what happens when a technology arrives right as the ground shifts under it.

All opinions and views expressed in this episode are my own and do not represent my employer or any affiliated organizations.