I'm having trouble with this too.
I'm using a gigabyte h97n-wifi motherboard with a broadcom bcm94360cd in the mini-PCIe slot using an adapter. At the moment, I'm not using the USB-d cable to provide power from the motherboard as I think the mini-PCIe slot has power (if I've understood that correctly?). I'm running Yosemite 10.10.1
I have two 15cm pigtails connecting J2 and J3 to the backplate antenna connections, and two 25cm pigtails connected to two antennae in one of the rear expansion slots.
bluetooth is working fine. Wifi is registering as active in the menu bar, and the card is recognised in the system profiler, just as the OPs image shows. However, no wifi networks are detected. There is an iMac two meters away that detects our home wifi as well as the neighbours.
does anyone have any idea what's wrong?