not only is the numder of displayed bars random, its non-standardized and arbitrary: there is no standard meaning!
Fluctuation could be due to a number of things: interference from other networks, microwaes, garage/door remotes, plasma screens, baby alarms, mobile phones, the list is endless
Scan your area with something like WiFiFoFum and see just whats wifi is on what channel - and put yours, as far as posible on a free channel (note that channels overlap...)
N rated routers tend to have a more powerful signal - though to benefit you also need N rated wireless adpators in the PC
Finally you can get wireless extenders - effectively wireless relay units. I've had mixed success with these, and some are a PITA to setup, but the last couple I've installed have been OK
What router do you have? If we know that someone here should be able to suggest a matching unit
Last edited by Milo Minderbinder; 26th Jun 2012 at 17:09.