WSJ wrote:
Carlos Villalobos, 21, who was selling tube-shaped digital antennas at a swap meet in San Diego recently, says customers often ask if his $20 to $25 products are legal. “They don’t trust me when I say that these are actually free local channels,†he says.
Earlier this year, he got an earful from a woman who didn’t get it. “She was mad,†he recalls. “She says, ‘No, you can’t live in America for free, what are you talking about?’â€
Almost a third of Americans (29%) are unaware local TV is available free, according to a June survey by the National Association of Broadcasters, an industry trade group
The original WSJ article is here but it's behind a paywall.
https://www.wsj.com/articles/millennials-unearth-an-amazing-hack-to-get-free-tv-the-antenna-1501686958Here's a recap:
http://decider.com/2017/08/02/millennials-looking-for-free-tv-are-discovering-the-convenient-charms-of-the-antenna/