A:Answer You can connect a cable set-top box to the LG 65 inch Class 4K Smart UHD TV (64.5'' Diag), Model # 65UM6900PUA via its HDMI ports or via the F-Type 75-Ohm, Coaxial Connector in the back labeled "Antenna/Cable In" If you connect your cable set-top box to the coaxial connector, your programming will not be in HD (High Definition), it will be in SD (Standard Definition) The picture will not fill up the TV screen. YOu can also connect an indoor or outdoor antenna to watch Over-the-Air (OTA) TV Broadcasts of local TV Stations like ABC, NBC, Fox or CBS to watch live TV shows or sports being broadcast on those channels in high definition. Free broadcast TV offers noticeably higher visual quality than cable. Most of the major television channels (especially sports channels) simultaneously broadcast on OTA and cable TV so you can watch networks like ABC, FOX, CBS, and NBC in higher quality...^IFV