I'm lucky if I can get more than five feet away from my Linksys wireless-G router before the Airport Extreme says it's getting no bars. My son also has an Airport Extreme card in his iMac; connection is always iffy, even though his computer is barely four feet from the router. Do I need a wireless-N router? Is there no backwards compatibility here (e.g. shouldn't a wireless-G router be able to work with wireless-N Airport Extreme cards?) Thanks in advance.