janeilson,

Page 7 of the manual (downloadable from the support portion of samsung.com) lists that it has the ability to unscramble cable signals without a box (QAM) and will have an ATSC Tuner.

QAM will unscramble cable channels, although this is primarily up to the cable companies which HD channels will be unscrambled. There varies from region to region.

ATSC is the new HD transmission format that will take over when the digital transition is put in place and the old one (NTSC) will drop off.

Hope that helps, and thanks for considering Samsung.

--HDTech