Another question about the Xbox 360: Wireless Connection

[SHMUPGurus]

You guys are kidding me right? Now that's simply ridiculous... >_>

My wireless router is upstairs and my living room (where my Xbox 360 will be) downstairs... So a wired connection isn't possible that's for sure!

Oh well, I guess I'll have to sacrifice Call of Duty 4: Collector's Edition, all thanks to Microsoft! ;_;