Determine that the TV is digital by consulting the owner's manual.
Check to see if the TV supports multiple input sources:
Look at the back of the TV. If the TV accepts multiple input sources, there will be a variety of red, yellow, black, and other input connectors located near where you would connect your TV cable or antenna.
If the TV doesn't support multiple input sources, an A/B switch will allow you to switch between the cable and antenna connection quickly and easily.
Digital TV - Connect the Antenna Only
Power off your TV.
Connect the antenna to the RF or Antenna connection on your digital converter box. Be sure the connections are hand-tight.
Place your antenna in an area where walls or other objects cannot block the reception.
When you want to watch local programming using the antenna connection, go to your TV’s input menu and select the antenna connection you set up in step four. When you want to return to watching cable channels, go to the menu and select your cable connection.
Adjust the antenna until you receive the clearest picture. Remember, these are over-the-air transmissions. Many factors, including weather, can affect your reception.