Hi, Could anyone possibly suggest what type of mimo directional antenna my TP-LINK MR6400 router would take please?, i can see the the mast from my house but i'm in an old building with thick walls an

Hi, I am in a quandry, i have a TP-LINK MR6400 4g lte router and i am trying to set up an outside antenna for it and would like to know if its actually compatible for an outside antenna?, it has two a