----------------------------
Network stumbler flags
----------------------------
??1? - encrypted
??0? - unencrypted


----------------------------
Wifi range
----------------------------
A typical wireless router using 802.11b or 802.11g with a stock antenna might have a range of 32 m (120 ft) indoors and 95 m (300 ft) outdoors.
http://en.wikipedia.org/wiki/Wi-Fi

A general rule of thumb in home networking says that 802.11b and 802.11g WAPs and routers support a range of up to 150 feet (46 m) indoors and 300 feet (92 m) outdoors. 
http://compnetworking.about.com/cs/wirelessproducts/f/wifirange.htm