I recently bought a laptop and for some reason my wireless signal on this specific laptop is never more than 3 bars. (I can be right on top of the wireless router and still on get 3 bars). It has nothing to do with my router it is 100% my computer not getting a good signal.
Its funny, I couple of months ago I was doing work and for 5 hours my signal was 5 bars and I could see all the other connections in my neighborhood. After that it went back to to 1-2 bars with no other networks.