https://www.recode.net/2017/10/2/16395850/roku-tv-broadcast-free-antenna-streaming-os-8

There are a couple ways for a tech company to get its hands on TV programming: Pay the TV networks a fee and re-sell those networks to consumers (See: Google, AT&T, Hulu, etc) or declare that “TV = apps” and let the networks and consumers figure it out for themselves.

Roku has a third way: Tell TV-watchers to get their hands on a broadcast antenna, then give them an easy way to watch the shows that antenna delivers.