wireless signal booster?

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Cool. So the interference has nothing to do with signal and more to do with the radio frequency? Okay will I have to upgrade my wireless cards as well? And I see routers that are a/b a/g or a/b/g will these work just the same as the plain A.

Also I'm cheap so I'll ask if there are any brands better than others before I go buying the cheapest. Might as well just save the money and do it right.