call signs

[xoxoxoBruce]

In the beginning there was Westinghouse radio;
KDKA - Pittsburgh.
WJZ -Newark, NJ, later NYC.
WBZ - Springfield, MA, WBZA - Boston... later the two switched.
KYW - Chicago, later Philly.
WOWO - Ft Wayne.
And it was good.

Since Westinghouse was one of the founders of RCA, which started NBC, Group W was a major player from the gitgo.
But it was the FCC making the rules which shaped the industry... after brandy and cigars with Westinghouse biggies.