I found the source! The distributor at least....

While pondering the internet in my usual journey through Google, a small question popped in my head, "Is there a radio coalition for public radio stations (similar to IHEartMedia that sort of thing)?" And  then I found Public Radio International.

Public Radio International (PRI) is a Minneapolis-based company that was founded in 1983 under the moniker, American Public Radio, trying to become an alternative to NPR. With a large expansion in the 1990s, PRI found themselves doing business in the United Kingdom for the BBC, and now holds offices in the US, UK, China, and other European hubs. PRI is now a distributor, providing programming via satellite telecommunication to many public radio powerhouses. PRI helped transition the move from traditional public radio formatting to the private satellite sector, ensuring that public radio retains the integrity it has charmed nations with for generations.

PRI is currently headquartered in Minneapolis, MN.