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“hooking up attic/roof antenna I have Comcast cable directly into Comcast HD box, Box connected to TV by HDMI cable. Can I connect attic/roof antenna to the coaxial "in" port on the TV? I want to do this to use it as back-up when cable goes down. I notice there is a separate icon/tile for cable and another for antenna at the Roku "home".”

Asked by low tech 
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