I installed the 2.4GHz Mikrotik R11e-2HPnD wifi card with up to 1000mW output power (30dBm) and the 5GHz 802.11ac wifi card Mikrotik R11e-5HacT with up to 200mW output power (23dBm).
Also, I installed 5 dedicated (Linksys) antennas and a Samsung 850EVO mSATA SSD. And, I am using DeLock 88936 (RP-SMA to MMCX) cables. Quite a performance