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You fell for the 'hidden SSID' myth?
Also, try these.. Download and install Xirrus Wi-fi Inspector and the associated gadget. Run them both with your SSID hidden and showing..
Go to this website..
If Xirrus shows the SSID when you have it hidden, then anybody running Xirrus can also see the SSID..
Post your findings back here..
A better way to protect your connection is to use Mac address filtering..
And if you have a D-Link router..