It is increasing, a lot. There was a recent study that had OTA using households increase from 9% in 2013 to 15% in 2016. Or as one headline put it "almost double".
Added: Here are some numbers not from memory:
* http://www.ooyala.com/videomind/blog/ota-usage-growing-more-...
Added2: OK I found my numbers, which were slightly off. Fixed...
* http://www.providencejournal.com/news/20170127/tv-antenna-ri...
I don't know anyone my age that doesn't watch mostly streamed content, but we all have digital antennas for local broadcast and the important live events.