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the cantenna is very directional outdoor antenna and its designed primarily for distance rather than spread for problems like this it isnt going to be much help. There are external booster antennas avilable cheaply for most wireless access points. I highly recommend against consumer grade repeaters as they generally cause as many problems as they solve. Most of the less expensive repeaters have no spread spectrum capability which means they have to listen and broadcast on the same frequency using half duplex, that usually leads to lots of dropped packets without much error correction resulting in retransmissions, which in turn slows down the network conciderably.
Of course the best solution would be to optimize the location of the access point. Most people make the mistake of just putting the access point in the same room as their computer regardless of location in relation to the rest of the area needing coverage. The rf spread of a typical wifi signal from a straight omnidirectional antenna like is found on consumer wireless routers is shaped like a donut with an equal signal on all sides and the weakest points being directly above and below the antenna. So for optimal coverage your best option is to place the AP directly in the middle of the house of office.
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