It's also worth noting that new equipment can feature not just the newest "N" wireless networks which are faster and cover more area than the older "A", "B", and "G" networks, but also more antennas, radios, and bands. For instance, some "N" wireless gear can now broadcast on 2.4Ghz (cheaper), 5Ghz (more coverage area, less interference), or both.
Wireless equipment with more than one radio can help solve an annoying situation where the slowest gadget on the network slows down the entire network. For example, handheld games and smartphones frequently hop on wireless networks but will slow down any one-radio network to their speed -- even if other gadgets and computers can go much faster.
This article in The New York Times mentions some of the latest wireless equipment and common problems.
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