D-Link DWL120 External Antenna Modification
There isn't much difference between this modification and the one for the NetGear MA101. Both have a dual diversity antenna arrangement with one antenna on a flylead that can be rotated to improve reception.
Opening the case is simple, just use a sharp knife to lift off the 4 rubber feet, then undo the screws.
The bottom left of the PCB shows the antenna lead soldered directly to the PCB.
The next picture is with the tin shielding removed (kind of obvious really!)
I clipped off the antenna lead about mid way and simply attached a bulkhead SMA socket, space is tight but there's just enough room to fit the socket to the case.