Hi, I have trouble understanding why my wi-fi signal is not strong as it should. I have an Airport Express, not really far from my iMac (like 8-10 feet away). I was able to check the strength of my signal with iStumbler and is varies from 47% to 52%. My channel is set to 1 (as opposed to 6 for my neighbor network). So how can I boost the signal? Why is it so low? I cannot find any solution so far, any help would be welcomed Thanks!