Being a bit new to the wireless thing, I have a question pertaining to the AirPort Extreme base station and my 15" TBook. I have noticed that occasionally my reception will vary well within the 150 ft. limit that I am supposed to get. Is that a normal thing. I never am beyond 50 ft. and most of the time less than that. Overall I am quite satified with my setup and usually reception is good. Just curious about those infrequent occasions.