Yes you Cantenna!
Wardrivers sometimes employ long-range antennas to both access and exploit Wi-Fi networks from a great distance. The NextG TurboTenna (around £70) can detect networks from hundreds of feet away. It’s popular with campers to make use of free Wi-Fi hotspots!
If you’re handy with a soldering iron, consider building your own cantenna. This involves finding a Wi-Fi USB dongle with a detachable antenna and replacing it with one you’ve made yourself using a soup can or similar. You’ll also need an N-male to RP-SMAmale cable, a female N-connector for the can and some 12-gauge copper for the wire element. The dimensions of the can (ideally 3-4 inches by 5) and length of the element are crucial. You can find a calculator here to get started ( www.changpuak.ch/electronics/ cantenna.php). You can also view instructions with photos at http://bit.ly/LXF229can.