Extend your wifi range upto 5 km

you can have free internet from unsecured lans, lol
Make 2.4GHz parabolic mesh dishes from cheap but sturdy Chinese cookware scoops & a USB WiFi adaptor ! The largest (300mm diam) shows 12-15dB gain (enough for a LOS range extension to 3-5km), costs ~US$5 & comes with a user friendly bamboo handle that suits WLAN fieldwork- if you can handle the curious stares! for detalis click here