I don't see how that would gain any speed whatsoever, even from a file sharing viewpoint (where the massive speed advantage of 10/100 or Gigabit Ethernet is obviously preferred to wi-fi). A good quality phone extension will suffer virtually no loss whatsoever, and certainly not enough to affect an average internet connection. I would happily take a long phone extension if it allows convenient Cat5 networking. A good 802.11g network will achieve c.15-30Mbits per sec, the Ethernet standards are self-explanatory, and even an ADSL Max internet service offers c.6-7Mbits at its absolute best. That's if you live next door to the exchange an happen to be the only person using it. So wi-fi versus Ethernet is not an arguement worth thinking about purely from a connection speed viewpoint. Therefore avoiding the extension will not have any gain.