Hello all. I am using an Apple Extreme Base Station and it has been awesome. The only problem recently is that my iPhone 4S does not get more than 6Mbps download and hasn't for the past couple of months. In fact, most of the time it averages between 0.5-4 for download speed and 0.3-1.5 upload. I have the following devices connected to my wireless network: 1.)iPhone 4S 2.)iPhone 3GS 3.)21.5 inch iMac Mid 2010 4.)iPad mini(never less than 6.5 mbps and as high as 20.22 mbps DL) 5.)iBook G4 I think my iBook G4 is the problem, but not entirely sure since even when it's powered off and not connected to my network, my iPhone still gets really bad speeds. Does anyone have any advice regarding a better setup with simultaneous networks and guest networks to make sure every device works as fast as possible? Thanks in advance!