I have an Apple iBook and newly purchased Apple iMac, however, the Wi-Fi signal bandwidth on the iMac is consistently and considerably less on the iMac versus the iBook laptop. I have moved the iMac around to different areas of the house to see if the bandwidth reception would change or increase, but no dice. I can move the iBook to the same areas of the house and the bandwidth is consistently better. I have even placed the iBook next to the iMac. The iBook Wi-Fi bandwidth is fantastic while the iMac's bandwidth crawls. The ISP is pointing to Apple as having the problem and Apple is pointing to the ISP. If the bandwidth is consistently performing at the same level throughout the house for both devices, I suspect it is a wireless card setting on the iMac that needs tweaking. I have run speed tests on both devices and the iBook is consistently 10 to 12 times faster than the iMac. How and where can I tweak the setting on the iMac’s Wi-Fi card to increase it's bandwidth reception?