Hello, I'm running an A1289 (bought late 2011) mac pro 2.8qcx, 12g Ram, 2tb hard drive with BT infinity ISP. The problem is that the wireless speed on the machine is anywhere between 0.8mbps and 9mpbs. Whereas if I put my early 2009 macbook in exactly the same position, or even further away, I can get speeds between 30 - 40mbps. The router is about 18 feet (5.5 metres) away and doesn't pass through any walls, just through one open door. Does anyone have any suggestion to improve the signal strength? Many thanks in advance.