wadio said:it's amazing to me that stations didn't give up on this several years ago, especially AM IBOC. When consumers reject a technology as soundly as this one, clearly it's time to move on.
Consumer rejection of IBOC is only one piece of the puzzle. The biggest obstacle AM radio now faces is noise, from multiple sources (power distribution plants and infrastructure which have been allowed to deteriorate, poorly- or non-filtered switching power supplies in all sorts of electronic devices including computers and LED traffic signals, to name just two). The assumptions made more than 70 years ago as to what signal strength will adequately cover a given area are no longer even close to reality, thanks in large part to an FCC which refuses to enforce its own Part 15 rules on RF-generating devices. So, the FCC's solution was to allow yet another noise-maker: HD. If not for its horrific codec which causes the high audio frequencies to sound like a screech, HD might have made it in a new band with no analog stations and no problems with noise...but putting it on the AM band doomed it, and no AM operator with an ounce of common sense is going to turn off his/her analog signal, otherwise known as the signal that puts bread on the table.
If FCC commissioner Ajit Pai is really serious about "saving" AM, as he has stated, he'll start by giving AM-HD two in the hat.