I doubt that's possible, but if your cable has internet, you could use it and have the router closer to your cable and modem. In which you could use ethernet or moca. You may even save money and 1 less bill.
Series 2 (PLS, sold)
TiVo HD 1TB (157 HD Hrs, PLS, "652")
Roamio! Oh, wait, Its Juliet!
OTA! OTA! OTA!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!