If you've been thinking about going the cord-cutter route, consider this a sign. Best Buy is selling the SiliconDust HDHomeRun Connect for $70 right now. This external TV tuner features two tuners, allowing you to watch over-the-air (OTA) broadcast TV on two sets or to record one show while watching the other.
The Connect's specifications say it supports up to 1080p, but broadcast TV is usually 1080i. That's still 1920-by-1080 resolution, however. The one extra thing you will need in addition to the tuner is a digital antenna.