The Tivo S3/HD/XL has tuners that are analog (NTSC) and digital (ATSC), so it does not work with other converter boxes whether for over the air or cable, nor is it needed. Satellite will not work either, but the Series 2 does work here.
S1 (Recycle heaven)
Series 2 (PLS)
TiVo HD 1Tb (OTA, PLS)
Do the 3 R's to be GREEN, Reuse/Recycle/Recharge and RECHARGE the earth!!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!