Synchronised AM networks.

[ChrisW6ATV]

Originally Posted by Colly0410

Were single frequency networks ever used in USA?

No, they have not been, and also RDS and its ability to automatically switch a car radio to a matching channel/station has never been used here. The main reasons are:

-The USA is a much more spread-out country than the UK or most of Europe in general.
-Radio broadcasting and station ownership here were always privately owned, and often locally owned, so there was much less centralization of programming here, no BBC equivalent. There have always been radio program networks, but they seldom or never had complete control of any stations, much less a full, wide-area set of them.

Now that a few huge media corporations own a large percentage of stations across this country, the RDS-type switching could probably be feasible here now if not soon. (Whether it is a good idea, though, is another discussion.)