Agree with Colin, 200m for indoor is pretty far. Note as well none of our indoor APs have separate 2.4ghz and 5ghz connectors, so you if you use a directional antenna, both bands will go out of that antenna. You can use instead a pair of AP-228s, but those are more costly. Additionally, indoor Aps are lower powered generally so you can use external antennas but will need to up the power.
But if you are shooting down a hallway, you can certainly try it, but performance may not be that great.