dosent take even 1/4th of your brain to hack thru it if you know the system, there was even a news article how to hack in with 5 mins in newspaper long time ago...
Actually the safest way is to remove the SSID broadcasting, and give your network a strange name. While a WiFi detector might still show it, without knowing the network name it is going to be hard to connect, so any hacker would just find a more easy one.
It also make that you can connect without a lot of passwords from any PC, just by entering the network name.