i have the same exact router, and i get excellent signals a floor away... but there was heavy interference with other wireless networks around. I suggest getting into your router firmware by putting 192.168.2.1 into any browser...and changing the channel and put protected mode on...it will be better for interference. most importantly, make sure that it is broadcasting the SSID. otherwise, you may lose the connection easily and not being able to find it....also, put on some security, like WEP or WPA or the like.... hope this helps.
on a side note, my wireless capabilities were really crappy at first... I get strong signals with no internet, or internet with weak signals..sometimes it didnt even connect when it was like 2 feet away from ap to wireless card... but after a day or two after leaving it on...it kinda "broke in" and everything was stable.
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