So here are some basic tips for securing your wireless router/access point and computers with 
wireless adapters:
1. Change the defaults. Wireless routers and access points come with a preset administrator password and SSID (network name). These are usually the same for all routers/WAPs of that model, so it’s common knowledge to tech savvy folks. A hacker can use that info to change your WAP settings or connect to your network.
2. Turn off SSID broadcasting. This makes your network visible to anyone in the area who has a wireless-equipped computer. Turning it off doesn’t hide it from WLAN "sniffers" but it does keep casual browsers from knowing it’s there.
3. Turn on MAC address filtering. This allows only computers whose MAC addresses have been entered by the WAP administrator to connect to the network. It’s not foolproof since some hackers can spoof MAC addresses, but it provides a layer of security.
4. Assign static IP addresses to your wireless clients and turn off DHCP, so that unauthorized persons who try to connect won’t automatically get an IP address. SunbeltBLOG: Sunbelt TechTip: How to Secure Wireless Routers and Computers
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