Here’s an ad touting the reach of Westinghouse’s radio stations.

Also known as Group W, the Westinghouse Broadcasting Company started with the sign on Pittsburgh’s KDKA in 1920, the oldest surviving commercial radio station in the country.  Over the decades, Westinghouse expanded into television and became one of the most respected broadcast operators in the country.  

Westinghouse acquired CBS in 1995 and its broadcast properties took on the CBS name.  Westinghouse changed its name in 1997 to CBS Corporation.  The company was merged into Viacom in 2000.  

Source: Wikipedia (Westinghouse Broadcasting)

A couple of days ago, this blog featured a great wartime ad from Nashville’s WSM.  Here’s another fascinating one from Westinghouse Radio Stations, touting wartime security measures to fight sabotage at its radio transmitters:

At KDKA, high on a commanding hill, visitors are challenged by a searchlight, a directionally amplified voice, and a gun, and they state their business into a microphone before they come near the tower.