Ubiquiti Networks NanoStation AC loco (NS-5ACL)

Custom QCA9882
It's worth noting that the integrated QCA9882 has a nonstandard PCI id of 0777:11ac.

Note that a number of sources suggested this device was a re-branded QCA9888. This is not the case: the footprint of the QCA9888 is different from the device on this board (see e.g. the internal photos for MSQ-RTACRH01, page 4).

Mailing list records also appear to confirm this.