Turn on encryption. I don't care if it's ROT13 or AES, whatever the highest form of encryption your wireless can do.
Change your ESSID.
Make your access point NOT broadcast the ESSID.
Make it so only MAC addresses that are on your systems can connect.
All that should be in your user's manual and they're easy enough to turn on. Turn them on.
Sent from my rotary phone
"The way I see it as soon as a baby is born, he should be issued a banjo!"- Linus Van Pelt
UNIX - Not just for Vestal Virgins any more