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Your main coaxial cable comes from your wall to your comcast box. Another cable will connect to the box and screw into the cable port on the back of the tv. If your comcast box has an HDMI port, you can get an HDMI cable plug one end into the box and the other end into one of the HDMI ports on the tv. If you do it this way you do not need to hook up the coaxial cable from the box to the tv.
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