There were only a couple of people on the staff at Rush's "network" back then. It was not owned, yet, by a big broadcaster; it was a a tiny self-created creation of Rush and his Excellence in Broadcasting network.
I thought his first syndicator/employer was EFM Media. And his first "network" was an available satellite feed from ABC Radio, where he did his show, plus a WABC local show, when he was based in NYC.