Since this is a hardware forum, I suggest we use the "Cone of Silence" to keep others from hearing the WiFi signal.

An alternative is to make sure that no other Wifi recievers that you don't want to hear your broadcast are about 5 miles away.

If you are asking about software configurations, you may want to post in a networking or software forum.

Bob.

PS. The answer might be... Enable WEP and MAC filtering. As this is a Hardware Forum, be sure to post about hardware.