St. Louis Radio Station (STL), Missouri.
St. Louis Airway Radio Station during the late 1920s or early '30s. 
Barely visible in the photo is the wire strung between the tops of 
its twin antenna towers. During this era, some stations were making 
hourly weather broadcasts. When needed for safety, they also 
accepted messages from the airlines and transmitted them to pilots 
aloft. 

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