I think this is what you are looking for.
I think others may have misinterpreted the original question. Feel free to correct me if I'm wrong, but isn't the poster looking for the equivalent of a ethernet to wireless adapter such as the linksys wireless game adapter?
This would plug into the MVP and talk directly to the original poster's existing wireless network.
Or is someone suggesting that he purchase a 2nd wireless gateway/router to use as a bridge to the existing wireless infrastructure?
#1) Athalon XP 3200, WXP SP2, 2Gig RAM, Hauppauge MCE-150
#2) Celeron, @ 2.2 Ghz, Windows 2003 server SP1, 1Gig RAM, 2 x Hauppauge MCE-150s (running 24x7)
#3) PopCorn Hour.. I'm working on that one.
XBMC & 2 Hauppauge Media MVPs connecting to the server.. and a couple Terrabytes of kids shows.