Breaking Walls is a once-per-month audio documentary on the history of American Network Radio Broadcasting, focusing on people, places, and events from the Golden Age of Radio.
http://thewallbreakers.com/
To find out more about James Scully:
http://thewallbreakers.com/jamesscully/
I personally recommend listening to episodes in this order to get the full story of the beginning of Radio Wave, and the beginning of the three major networks NBC, CBS, ABC.
EP75: We Are Echoes—The Birth Of Radio (1887 - 1912)
EP76: Over There—The War for Radio’s Airwaves (1912 - 1922)
EP77: The Birth Of The Radio Networks—From NBC To CBS To Mutual Broadcasting (1922 - 1934)
EP82: Depression, War, And The Birth of ABC (1932 - 1946)
EP83: Sarnoff & Paley: Tainted Friendships, Tall Tales, Talent Raids, and TV (1934 - 1952)
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Okay so I'm going to copy and paste from James Scully's page for the high lights .... because truly I can not beat his own words for his own podcast.
Highlights:
• How the Titanic’s Sinking changed Guglielmo Marconi’s business
• The Radio Act of 1912 – What it portended
• Charles Herrold and KCBS San Francisco
• Lee Deforest sells out to AT&T
• Edwin Howard Armstrong invents regeneration, and later the superheterodyne receiver
• War comes to Europe
• The Navy takes over wireless
• How World War I caused radio technology to boom
• AT&T, Westinghouse, General Electric, and the newly formed RCA make a deal
• David Sarnoff’s Rise to power
• KDKA and the birth of regular broadcasting
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If you are interested in learning about the history of the Radio; going as far back as learning about the waves that make Radio possible then James is the best person to listen too.   He makes learning about the actual beginning of wireless telegraphy; and building the very first radio into a story ....  he brings to life the men and the women whom strive to bring the beginning of sharing of information beyond the newspaper; or telegraph.   He uses background music and sounds that is highly fitting for the time period.