The Zenith HD-SAT520 and sister Sony SAT-HD200 share features of their own, and have others in common with the Samsung SIR line reviewed in this survey. All three receive HD and SD DirecTV, NTSC, analog cable, and OTA HDTV signals. All three have DVI/HDCP outputs, four selectable scan rates, and an advanced program guide that seamlessly combines broadcast, cable, and DirecTV channels. Unique to the Sony/Zenith are a ''panorama'' aspect ratio, three different ''variable''-output scan rates, and an on-the-fly signal-strength button (for pre-scanned, locked-in channels only).

This review is 9 page survey of 7 HDTV Set-Top Boxes: Panasonic TU-DST52, Samsung SIR-T151, Samsung SIR-TS160,Samsung SIR-T165, Sony SAT-HD200, Zenith HDV420 and Zenith HD-SAT520.