If all you want is content from 101 W/L, then you can run two cables into your home, diplexing your off-air into one of the cables, and seperating again prior to the switch. Both cables would need to go to the switch. The HD TiVo, and/or content from 110 W/L and/or 119 W/L, is a different matter. With HD TiVo, you will want content from 110 and 119. You will also want off-air, as the TiVo includes 2 off air ATSC tuners. You will need a minimum of 3 cables to your boxes, two for HD TiVo, and one for your SD box. A 4th cable is recommended for off-air, however, you can diplex the off-air into one of your sat feeds. If your desire is to connect a switch, and have multi satellite capability, you will need at least 4 cables to the switch, and a highly recommended 5th cable for offair. Your off-air cable will need to be split, and connected to each of the two off-air connections on the back of the HD TiVo.
Good Luck
Alan