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Thank you for your inquiry! Yes, you can connect your Insignia™ 24" Class F20 Series LED Full HD Smart Fire TV directly to your cable without a cable box. To do this, plug one end of the coaxial cable into the cable wall outlet and the other end into the "Cable/Antenna In" port on the back of your TV. Turn on your TV and press the Home button on your remote, then navigate to the "Settings" menu. Select "Live TV" and then "Channel Scan." Choose "Cable" as the source and start the scan. Your TV will search for all available cable channels. Since you also have AT&T digital internet, you can take advantage of the smart features of your TV to stream content from various apps like Netflix, Hulu, and more. Keith | Insignia Support
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