POSITION YOUR ROUTER OR ACCESS POINT
WiFi signals can't detect where your home begins and ends. To reduce WiFi signal leakage, place your router or access point in the center of your home instead of near windows or doors. If you live in an apartment, you may consider mounting your WiFi in a closet to reduce signal strength.
When you're first setting up your wireless router or access point, be sure to change the default administrator password and default system ID, or SSID (service set identifier). While you're at it, go ahead and do the same for all your hardware and software. Pick a strong/unique password that doesn't include your name, birth date, or pet's name. Select a combination of upper and lower case letters and numbers.
TURN OFF SSID BROADCAST
ENABLE WPA ENCRYPTION
DISABLE REMOTE ADMINISTRATION
USE MAC ADDRESS FILTERING
INSTALL A PC FIREWALL AND ANTI-VIRUS SOFTWARE
TURN OFF YOUR NETWORK WHEN IT'S NOT IN USE