Wireless Router help

[everdred12a]

I'm not sure if I have a junky router or if it's my house, but I can't get reception from more than 30 feet away from the router. We have a linksys Wireless - G Braodband Router (model WRT54G). I don't really know enought about all of this to know if it makes a difference, but any help is appreciated. Also, if it matters, I'm trying to use it to play Mario Kart DS on the Nintendo WFC.

[Arnobius]

Are there any walls in the way? Also microwaves and flourewscent lights and some cordless phones also operate on the 2.4ghz level, which can cause interference.

An extended antenna or a range extender box are suggestions from Linksys

[everdred12a]

What's the price range looking like on those? Also, what kind of range extension would they give?