@Edent I disagree with the commenter there regarding diversity/MIMO FWIW. The antennas need to be oriented in parallel to cover the same area as much as possible.
In the extreme case, connecting multiple directional antennas pointed in completely different directions will have... problems.
That said... I'm not 100% sure I'm correct. This is something I learned working at a WISP 20 years ago, and I don't want to spend the time sourcing a citation for this.