Samsung UN55JS7000 Owner's Manual

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Connecting an Antenna
Connect a cable from an antenna or cable wall outlet to the ANT IN connector, as shown in the image 
below to receive broadcast signals.
 
"
An antenna connection is not necessary if you connect a cable box or satellite receiver.
Connections
You can enjoy broadcasts, Internet and external device's screen on the TV by connecting an antenna and external device. 
Connect an antenna, video device, external audio device, computer, or mobile device to the TV.