The links at the bottom of the article are also excellent.<p>At the 2013 Dayton Hamvention, there was a tour of the facility shown here: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=CbHjcwIoTiY" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=CbHjcwIoTiY</a>.  Apparently, the engineer who first designed the transmitter was barely 21.