Locate the AirPort card at the top center of the logic board and just below the hard drive.

Use the flat end of a spudger to gently pry each of the antenna cables off their sockets.

Do not disconnect the antennas by pulling on the cables as this may damage the cables, connectors, or sockets.

The antennas have markings to help you identify their order. The antenna with no marks goes to "CH0", the antenna with one mark goes to "CH1", and the antenna with two marks goes to "CH2".