The TV tuner card is a thin rectangular silver plate with sockets that can take TV antenna cable.It may have the letters "DTV" and "ATV" stamped on it.
If the NTB model number ends in a zero (e.g. NTB110 or NTB3280) then there should not be a TV tuner card.If the NTB model number ends in any other number (e.g. NTB115 or NTB 3285) then it should have a card.