Mike has a Slingbox 350, which cannot be connected to a router through Wi-Fi. He would need the Slingbox 500 for that, but Leo has the solution without Mike having to bring back his current Slingbox.
Leo suggests using powerline networking, and Slingbox even sells the adapters to do this. Powerline networking uses the electrical wiring in his house to transfer data through his network. Slingbox actually sells the adapters to do this, and he can look for it at a place like RadioShack too. In most cases, this works pretty well, and would allow Mike to hardwire in his Slingbox without needing to be next to the router.