My comment was more about the range of 5ghz vs. 2.4ghz. What you describe
is exactly right...the more 2.4Ghz neighbors you have the more interference
because the signal travels farther. 5Ghz is nice in your own home (which
is what I have too), and the whole point of 5ghz is for faster speed. But
out in the field my tent might be a ways away from the NUC and 2.4ghz
provides more range for the signal.
Mounting the antennas was not a trivial job. It can be challenging to find
the right place to drill the holes, and routing the cables was probably the
most difficult part. The way I had to do it, I actually have to remove the
antenna mounts and physically move the antenna cables before I can access
the main PCB in the NUC body.