How did you
find this out?
( Flapjack I spay a little mare for you, Mon 4 Jul 2005, 10:49, archived)

I took my laptop outdoors
...kept the streaming internet radio going, looked at the signal strength on the toolbar, and roughly mapped out the area that my access point covers.

Quite some way, as I discovered.
(witty_ditty has made multiple miaows since, Mon 4 Jul 2005, 11:06, archived)