If you had said you didn't have the antennas in your first thread, my answer would have been different. But what I would have said is to buy just the antennas. There are a number of them for sale on e-bay.
You won't benefit from a PCIe WIFI card significantly. That board is already dual band and "AC". It has movable antennas. That is as good as it gets for WIFI.
If you had said you didn't have the antennas in your first thread, my answer would have been different. But what I would have said is to buy just the antennas. There are a number of them for sale on e-bay.