Pretty good. Router on lower level, and when directly above on upper level through most walls it stays at 3 bars with occasional 2. On lower level it is on 3 bars almost the whole time. I have read of some users changing to b or a only as g can get a lot of interference from various household appliances. Ultimately I may just upgrade to a dual band n router, use the n for the iPad, g for everything else, and take advantage of external hard drive support like the airport extreme.