Not ever having been to San Francisco, I have read here that 810 has a superb signal that reaches a lot of desirable geography. For a long time KCBS and KNBR got decent ratings with AM only.
KCBS felt the need for an FM simulcast beginning in 2008---15 years ago.
KNBR did well in years when the San Francisco Giants did well---they carried the games.
For younger audiences is the problem with AM really the "image" of AM?
I don't know if it's so much the "image" as the superior audio quality of FM and the lack of any consistent habitual AM listening in their lifetimes.
And let's define "younger" while we're at it.
I'll be 68 in three months. I started listening to FM stations when I was 12. If a format was available on FM, all things being equal (i.e., it didn't suck in comparison to a station with the same format on AM), I'd choose the FM.
It's been 45 years since FM began causing huge problems for AM music stations nationwide.
In 1982, 41 years ago, most AM top 40 stations finally surrendered to by then dominant FM competitors. Adult Contemporary stations on AM pretty much ran up the white flag by 1988---35 years ago.
So the people that spoken word radio stations aim for---35 and up---largely don't have a history of listening to anything on AM. Maybe news, maybe sports.
But given that most people spread their listening around five or six radio stations---even those who do listen to an AM station likely listen to several other FMs. It's now in an AM station's best interest to have a presence on that FM band---to essentially be where the "ear traffic" (as opposed to "foot traffic") is.
And to that point, here's a post I did when KGO flipped to Sports Betting last year---that uses the analogy of a shopping mall to show the decline of AM over time in San Francisco:
If there were a way to promote a something new on AM as really just an extension of the phone/internet App, would that give them a fighting chance?
If there was a type of video programming that was only available on VHS tape, would you go back to VHS just for that?
I asked elsewhere about what kind of earnings could KGO be getting with a .2 6+ number (I know that is not a business useful chart) I tried to contrast that with Buffalo's WECK with a 4.8 playing oldies - which station is earning more?
KGO's billing is not tied to ratings---the sports betting programs are buying the time.
Looking at WECK's website, they simulcast on three different FM frequencies, so that 4.8 is single-line reporting that includes people listening to them on FM.