Also, what other networks are nearby using the same wireless channel? You might be able to get a better signal on a different channel, such as 1, 6, 11.
Microwaves, 2.4 gHz cordless phones are other things that can interfere with wireless connections.
You might benefit by re-positioning the wireless adapter for better signal.
Ideal strength is about >70%
Series 2 (Retired, now sold)
TiVo HD 1TB (157 HD Hrs, PLS, "S3HD")
Roamio, Oh Roamio!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!