I'm prety sure that MIIP supports Wifi, and we are using a USB broadband card through verizon to connect to our server, without really any special modifications.
Have you tried to uninstall the client and your wifi programs/drivers and reinstalling them?
When you say you've "opened the server console", are you saying you've opened it from the client using the wifi connection, thus establishing that its actually connecting? Or are you saying that your server is working properly?
Also, which version of MIIP server/client are you using?