The Mikrotik LDF 5 ac (RBLDFG-5acD) is a device in the formfactor of a satellite dish feed (in sat tv called LNB) with a single Gigabit ethernet port with PoE and 5 GHz 802.11ac 2x2 MIMO single radio for bit rates up to MCS9 (867 Mbps). It can be combined with parabolic offset dishes of various size and gain to connect over large distances in point-to-point connections. See https://mikrotik.com/product/ldf_5_ac
The LDF 5 ac is ipq4018 based (quad core 32 bit ARM, 716 MHz) and comes with 256 MB RAM and 16 MB flash.
With the valued help of robimarko have created OpenWrt support for this device that can be tested here:
github.com/wwortel/openwrt (choose branch Mikrotik-LDF-5-ac).