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:
• Why the Blizzard of 1888 played such an important role in the need for wireless telegraphy
• Who Was Heinrich Hertz? What experiment made him the father of Hertzian Waves?
• What Oliver Lodge, Nikola Tesla, Alexander Graham Bell, and Amos DollBear have in common
• Guglielmo Marconi, father of
• The benefits to wireless telegraphy
• David Sarnoff — His start between 1900 – 1906
• Why the press want to get involved
• Lee Deforest — Inventor, Fraud, or both?
• What incredibly important event happened in December of 1901 in New Foundland
• Why the American Government wanted to regulate wireless telegraphy
• Reginald Fessenden, Christmas Eve, Oh Holy Night, and Brant Rock
• The Titanic Disaster — How it changed wireless telegraphy forever
• The Radio Box Memo
• What’s next?
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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.