The Premiere 4/XL4 is digital cable only, no analog or OTA. You can tell which models they are as they have 4 red lights in front for its 4 tuners, while the other premieres have 2 tuners and can receive analog and digital , OTA as well.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!