I think I replied incorrectly before. In your case you'll want a second router configured per post 17 of our Networking Forum sticky.
I currently own a WNDR3300 Netgear Wireless N router, and I need major help. I installed DD-WRT on it already, and have the TX power all the way up to 155, but my range still is horrible, and often disconnects. It has all internal antennas, so I can't even change out the antennaes like I wanted to. Any ideas?
If you have any suggestions for a good router I can get for around $40 refurbished/used also please link them.
Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic