First, you should have a site survey done to make sure the area is covereved. Is this all office area or some warehouse. You can look at either the 1131 or the 1242 with external antennas. There is no ap that can cover this by itself. In an open area, you get around 300ft with good RSSI. So depending on your envrionment, either the 1131 or 1242's should work for you. There is a 1252 that supports 'N', but I doubt if that is what you are looking for.
-Scott
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