Misleading WiFi Speed Claims

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Guy Kewney of Newswireless.net in El Reg questions why the Netgear class action case only applied to NetGear, given the absurd figures quoted by all WiFi hotspot providers. He gives an understandable idiots guide to WiFi speeds and concludes

Quote:
As a rule of thumb, if you take the WiFi standard bitrate, you can work out the payload easily enough by dividing by two. Rarely, it will be faster; usually, a lot less. Put two access points on the same channel in the same area, and it can be so much less you may even wonder if you're connected.