Antenna mod for hAP ac2 (RBD52G-5HacD2HnD-TC)

Has anyone here done the antenna mod referenced below on the AC2?  I have about 400' to reach the tower node.  Internal antennas will not cut it and the limited (and poor) reviews of the AC3 are not encouraging.

https://forum.mikrotik.com/viewtopic.php?t=153582

This appears to be the mating connector.

https://www.ebay.com/itm/143671356456?_skw=ms156+pigtail&itmmeta=01JHY2F...

TNX, Robert