Zenith HD-SAT520 DirecTV Digital Set Top HD Tuner/Receiver Fully integrated high-definition tuner/receiver with selectable 1080i, 720p, and 480p outputs Receives ATSC/HD, SD DirecTV satellite, and NTSC/analog cable signals 4-line Y/C digital comb filter improves analog resolution; 4:3 and 16:9 aspect ratios Advanced Program Guide unifies channel listings; 5.1-channel Dolby Digital decoder Includes DVI, component, S-video, and 15-pin RGB outputs; 16.9 x 2.7 x 12.8 inches (W x h x D)