Another trick is to place the Wireless G Router you have in a higher position in the room--that is, higher off the floor, the philosophy is that the signal does not have to go through any furniture on the way to the addition, just through the walls. If you know how to configure the router you can also force the wireless signal to remain on "channel 11"...this can help in some cases (the basic idea here is to use your computer to see what channels the neighbors' wireless networks are using and then use a different channel).