Currently Being ModeratedOct 2, 2012 8:53 PM (in response to kkollmor)
150 feet maximum clear space. Considerably less with any structural components such as walls, windows, etc.
Currently Being ModeratedOct 2, 2012 8:55 PM (in response to kkollmor)
150 max for express... Can be up to 300feet, clear space, for the extreme.
Currently Being ModeratedOct 2, 2012 9:00 PM (in response to kkollmor)
Range is almost impossible to predict for any wireless device. It is a function of a number environmental variables, most of which concern the type and construction of the building in which it is used, and the presence or absence of competing wireless networks and other sources of interference.
I can tell you that in free and unobstructed space, the range of an AirPort Extreme or Express is hundreds of feet because I've measured it. A single Extreme blankets my home and most of the area around it, even with its transmitter power set to minimum (10%). You will not be able to get that range in a Manhattan townhouse though.
All Apple products are now capable of using the 5 GHz band. Using it exclusively will mitigate the effects of wireless interference, at the expense of not tolerating intervening obstructions as well as 2.4 GHz.
Currently Being ModeratedNov 22, 2012 4:42 PM (in response to John Galt)
John, what do you mean by "even with its transmitter power set to minimum (10%)"? Or how do you set the transmitter power?
Currently Being ModeratedNov 22, 2012 8:21 PM (in response to JClayton)
The wireless transmitter power is adjustable. It is an option in Airport Utility > AirPort > Wireless > Wireless network options.
At least this is the case with AirPort Utility 5.6. If you are using AirPort Utility 6.x a/k/a the "Fisher-Price" version, see this thread to determine how to download and install a more useful version: HT5022 AirPort Utility 5.6
There is no benefit to using more transmitter power than you need. The only thing any excess power accomplishes is to make your wireless network visible to those who should be prevented from using it.MacBooks iMacs iPods AirPorts, OS X Mountain Lion, 27 years Apple!