There are all sorts of claims for earliest broadcast in North America.

KDKA, the Westinghouse (now Viacom/Infinity) station in Pittsburgh
claims to have pioneered broadcasting with the 1920 presidential
returns.

CFCF, Montreal, then owned by the Marconi Company, had experimental
broadcasts in 1919.

Some give the honor to Doctor Charles "Doc" Herrold, with his "arc
fone" (modulated spark transmitter) in the years before World War I.
Doc Herrold later owned KQW in San Jose which eventually became KCBS
in San Francisco which has, from time to time, claimed to be the
oldest radio station in the U.S.

Here is a blurb about a public high school in western Queens, NYC,
whose radio club broadcast the 1911 World Series in which the
Philadelphia Athletics beat the New York Giants, four games to two.

http://www.astorialic.org/starjourna...february_p.php

[...]
The first two wireless (or radio) stations in Queens begin operations
under government licenses. The Bryant High School Radio Club, which
had been in existence for two years, had 20 young (male) members.
During the 1911 World Series, the club made a name for itself by
broadcasting the game. They were able to receive signals from 800
miles away and transmit them over ten miles. The other station,
located on Jackson Avenue, was more powerful and with a forty-foot
mast on the roof of the building, able to receive signals from 2,000
miles and send them more than 100 miles.
[...]


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