KCBS First

[Ultimajock]

Westinghouse's KDKA can claim to be the first station to be licensed for broadcasting, in 1920.

...more accurately, KDKA was the first American radio station licensed for commercial broadcasting. The American radio station that has broadcast continuously for the longest time is WHA/970 Madison, a non-commercial Wisconsin Public Radio/NPR/PRI affiliate licensed to the University of Wisconsin; it, as 9XM, was allowed by the U.S. Federal Government to broadcast throughout the U.S. involvement in World War One, while all other stations (including the Herrold operation/KQW/KCBS) were forced to cease operations during the war...

[DavidKaye]

The first licensed station in the world was in Argentina (a few months prior to KDKA), and the station dates back to late 1909 and, unlike a few US stations, did not cease regular transmission during WW I. Around the turn of the century,

This is true.  "San Jose Calling" shut down during WWI, and when it returned to the air a few years later, radio technology had changed so much as to make Herrold's equipment obsolete.  He switched to a more standard design.  So, while there is a lineage of KCBS back to 1909, there was a gap.

[sloux]

I do know there is a plaque in San Jose at the former Charles Herrold College of Engineering and Wireless which is cool

What is located at the former CHARLES HERROLD COLLEGE OF ENGINEERING AND WIRELESS today?

I was on business there several years ago when the SJ Redevelopment Agency was housed there.  It is an office building.