I think you can try:
- Homemade Pringles antenna - Eat a packet of Pringles (ready salted would be my choice) then follow this tutorial to convert it into a functioning directional antenna. Point it where you need a signal boost.
- Airport Express & kitchen sieve - Take an Airport Express and set it into a common metallic kitchen sieve to boost it's signal further.
- Try a parabolic dish - Hawking make a 802.11 B/G parabolic dish
that basically pulls in a WiFi signal, performs some magic and boosts
your range by up to 300%! It only costs $80 and it has a cool retro
- Cantenna - This is basically a pro version of the Pringles tin hack. For $50 you can buy a Cantenna that plugs into your router and extends your WiFi signal. It also looks cool.
Also see this:
The Wi-Fire uses a powerful directional antenna, highly sensitive
receiver and proprietary software to find and enhance normal WiFi
signals. With it, you can connect wirelessly to the Internet-even at low
signal strengths-faster, more reliably and with a more consistently
strong connection-than you are able to with an internal wireless
The Wi-Fire draws very little power from your laptop battery. It
comes complete with everything you need to connect wirelessly to the
Internet. Just install the Wi-Fire Connection Manager, plug the Wi-Fire
into an available USB port and you're ready to start. It can rest on any
flat surface, laptop display or flat screen monitor.