No, it did not. As the market area expanded due to urban sprawl after W.W. II, more and more population ended up outside the effective signal area. And as noise levels increased due to new electrical and electronic devices ranging from fluorescent bulbs to TVs, the coverage became even more limited. By the 60's, it missed really significant parts of the market even in the daytime and at night it was miserable.
The stations with decent signals are still viable. WCBS. KFI. KOA. WGN. But in the top 100 markets, there are only about 170 stations that cover at least 80% of the market day and night with a usable signal. That means most markets only have one or two viable signals; the rest are not able to cover all the market so can not compete. That is not a technology problem; it is a licencing problem that dates back to the FCC's assessment of power and coverage needs back in the early to mid 30's.
Same thing. CBC is a quasi-governmental entity, which depends to the greatest extent on the government.
740 was increasingly noisy in downtown Toronto because they built the site too far out of the central area of the city. That turned out to be a nice thing if you were in Owens Bay, but not so nice if you were on Younge St. downtown in an office building. Built in the right place, 740 is as good for Toronto as 660 is for New York City.
WTOP did the right thing because there was no way to fix 1500. 740, properly built at the right location, could have adequately covered Toronto. The problem in DC was being directional on a horrible frequency. The problem in Toronto was not putting the transmitter for a beautiful low-dial-position AM in the right place because they wanted to get regional coverage and city coverage from one site.
The remaining life of AM will be dependent on the market and the ability of the few large market full signal stations as well as the small market community stations to be appealing. If you look at the rated markets, those big stations are still doing very very well and should do so for some time.
A good example on how this a market issue can be seen in, of all places, Buenos Aires. There are about a dozen stations in that market of 17 million which have 50 to 100 kw on good dial positions such as 590, 630, 710, 790, 870, 910, 990, 1030, 1070 and so on. They are either non-directional or purposely directional over the metro area. They are well programmed with news, talk and sports formats. And the AM share in that market is just a tiny bit under 50% of all listening.
If our FCC had taken a different perspective on power, US AM stations might still be in a much more significant position overall in the market.
That is not so. AM has been eroding since the mid-70s' when FM stations with a greater variety of formats and, in most cases, better coverage, started to dominate. It was in 1977 that FM passed the 50% mark in listening. Today, AM is at around 17% of listening. 10 years ago it was around 20%.
That's not a nose-dive. It is more like a very gentle glide path.
As long as 10 of the 30 highest billing stations in the US are AM, I think that there are plenty of AMs that are not ready to be put in a museum.