How to extend wireless network

Hi,

I work in a large building with plenty of walls and thick concrete floors to block WiFi signals. Right now we have a Netgear DG834GT that provides wireless networking and inteet access for the office and nearby areas.

However, we would like to extend the range by about 70 meters and through a thick concrete floor. I had bought 2 Apple Airport Express units that I intended to use for the job, but then found out that they do not work with non-Airport Extreme base stations in this...

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