These Over The Air (OTA) Tuners allows you to get local channels via free digital HD and SD ATSC & Standard Definition NTSC terrestrial broadcasts if your location allows it. All you need is a tuner below and the proper VHF or UHF antenna. Check with your local broadcast companies on what to buy or just buy a VHS/UHF antenna.
Just do a Google search on free local TV channels in your location and you will see what's available. Los Angeles has 20 channels. Get gorgeous video with these Over The Air HD tuners. They have an HDMI output to add an OTA HD Tuner to your WolfPack HDMI Matrix Switch.