I tried mixing 802.11g with 802.11n with an "n" base station (router), and had nothing but problems. Perhaps I just am not network savvy enough - but pulling the 'g' AE made everything run a whole lot smoother. No experience with the adapter you link to though. I think your cell interference comes in at 2.4ghz and you can now get 5ghz routers that should be immune to interference by the former.
802.11n USB network adapter
I use two years old MacMini limited to 802.11g with 801.11n capable Airport Express. I would like to use 802.11n for the reason of lower interference of cell phones etc. but not sure if adapters like this one http://us.startech.com/product/USB300WN2X2-USB-80211N-300-Mbps-Wireless-Network-Adapter-2T2R would work. How complicated this would be setup-wise in Snow Leopard? AE in my current setup is installed as "to join existing network" but my 2-wire wireless router is not 802.11n capable. Would you advise change or is it to much hassle (I have very few droputs).
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