3rd antenna for 802.11n pre-installed on some T61

[sugo]

Today I opened up the T61 and found that there is a white unused wire leading to the atheros abg WiFi mini-PCIe card. After taking out the atheros card I confirmed that it's an unused antenna wire.

Just a heads up for those who consider 802.11n card upgrade. You might not need to purchase the 3rd antenna.