This website is targeted at the US/Canadian audience, where HD Radio is used rather than DRM. HD Radio does exist for AM stations, but has failed to catch on ev

This website is targeted at the US/Canadian audience, where HD Radio is used rather than DRM. HD Radio does exist for AM stations, but has failed to catch on even more than it has failed for FM (which is a pretty sad story). In my market, for example, there is only a single AM station with HD that's receivable... and that's probably better than the average. It's a Spanish-language sports station, so it sort of falls into two of the popular AM brackets. In 2020 the FCC went ahead with adoption of "all-digital" AM stations with no analog audio. There are enough advantages to the all-digital arrangement, which is of course much more similar to DAB, that some people think it might breathe a little life back into HD radio - I'm skeptical, but only time will tell. In general AM radio has little popularity in the US outside of news and sportscasting. Foreign language stations are also a bit of an AM holdout since they benefit from the larger catchment area. Now I'm not sure that I agree with the authors criticism of IBOC HD Radio as unproven, it works quite well these days, but it is clear that remarkably few radio receivers on the market have HD radio support... even in expensive hi-fi and home theater receivers. Where HD radio has been fairly successful is in cars, with HD radio being a fairly common but far from universal feature in car head units.