Over the air content, which IS HD, is amazing these days. When my old DirecTV subscription dropped local channels, (this was years ago), I bought a new antenna to get the local channels and to my complete surprise there were 90 over the air channels in my area. All HD.
ALSO... no buffering, no glitches, no lag AND FREE, less the cost of the antenna which is around $40. For a while I bought a device that broadcasted over the air channels to my home Wifi which was nice but that can introduce some buffering.