Since I unfortunately do not have a router with technology 802.11ac I could not test here.
Due to the large price difference to my previous wireless card I have returned this again here.
Otherwise, the card makes a very high-quality impression. Similarly, the antennas. FYI: The magnetic bearing, with which can be attached to the side of the PC case the antenna, for example, is provided with a padding, so that there are no scratches or the like.