got the the same router as you try
Broadcast SSID
It is possible to make your wireless network nearly invisible. By turning off the broadcast of the SSID, your network will not appear in a site survey. Site Survey is a feature of many wireless network adapters on the market today. It will scan the "air" for any available network and allow the computer to select the network from the site survey. Turning off thebroadcast of the SSID will help increase security.
Broadcast SSID > More Info