For more information, see

http://www.bobsbasement.co.uk/index.php/Fake_Wifi_Access_Points

Disclaimer:

Do not use this without some idea of what's happening, you may
deny (nearby) legitimate wifi users service.

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Instructions for use:

You need an atheros-chipset wireless card in your Linux box.

Configure a virtual interface in monitor mode.
Ensure that this interface has the appropriate frame type, this
can be set by some command I can't remember now.

The binary takes the name of the interface on the command line.