Seth writes in with this Wii mod, crack the case, pop off the WNIC and add a 5dBi antenna for better signal -
“The Nintendo Wii is an internet appliance as much as it is a console, which means it needs an internet connection to fully realize it’s potential. But what if your Wii is nowhere near your network drop? Or if it’s too far away from your wireless access point? In this tutorial, see how you can upgrade your Wii’s wireless presence via the use of a bigger and more powerful external antenna.” – Link.