New TV, no stations - XFinity

My coax cable is connected to the input of a digital transport adapter. The DTA output is then connected to my old analog TV. This setup works fine. I just bought a new Samsung 40" LED TV. I disconnected the input coax cable from the DTA and connected it to the coax antenna input on the new Samsung TV. When I set the TV input to cable and scan for available channels, nothing is found. When I connect an antenna to the coax input and set the input to air, I find a bunch of channels. Why do the digital channels from Comcast NOT show up on my new digital TV?

This question, "New TV, no stations," is about XFinity-Comcast TV channels, programming, and sports.

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