All I'm saying is that the Emergency Alert System has relied on not just Telephone, but the AM stations that cover most of the nation.
AM stations did not cover most of the nation, except at night. At the time that the EAS replaced the EBS in 1997, FM stations covered significantly more population than AMs do in the daytime. But the media never grasped this with the New York Times writing "[FEMA] activates the alert system nationally at the behest of the White House on 34 50,000-watt stations that reach 98 percent of Americans."
In fact, in the daytime, those 50 kw stations cover more like 35% of the US population. And, while those same stations reach, with considerable variation, more of the population at night, few Americans in the 1990's and beyond ever listen to an out of town AM station so they would not hear any alerts.
Imagine how many Primary Entry Points the FCC will have to support in FM to meet just about the same coverage that a smaller group of AM Stations can support.
In most markets, the FMs outcover the best of the AMs. Whether it is Ishpeming, MI or Flagstaff, AZ or Tallahassee, nearly all the local FMs vastly outcover the day and night coverage of local AM stations... and those places are too far away from a major 50 kw AM for daytime reception and for reliable, easy night reception.
To cover the entire nation or even to adequately cover a region or zone, in most of the US, FM does a vastly better job with fewer primary stations needed.
From a safety standpoint, AM may just end up being there always.
Why? Many devices that have FM today do not have AM. If the industry gets more cell phones enabled, those will only pick up FM, ever.
And then there is the issue that many Millenials don't really know what AM is and have no clue where to find a local station, let alone how to turn the band on if their radio even has it.
Even if (lets hope it doesn't) the AM band is restricted to 640 and 1240 just to have that nationwide coverage should the Common Alerting Protocol (EAS over the Internet) and Weather Radio fail.
Most AM transmitters and antenna systems today can't be moved to another frequency like they could in the late 50's. Solid state transmitters will simple "stand down" if they don't see a perfect antenna match. To do 640 and 1240 ever agan, it would require separate transmitters built by the government... but the question is WHY?
I don't think the whole band is going away and if it is it is just stupid out of the reason that no station will ever have the coverage that AMs have now to cover the nation in an Emergency.
As I said, in nearly every market the Class B or Class C FMs cover vastly more than any of the AMs do and they do it reliably, day and night.