At one point we bought a fancy (for the time) microwave link to cover a distance of about 3km. We specifically asked whether it would be affected by weather conditions. We were assured multiple times in the most confident of terms that it would not be a problem, the technology was tested and such eventualities accounted for with various features and failsafes.

The thing proceeded to go down every time it rained, and no amount of tweaking settings, power, phase, polarity or orientation helped. This is the manufacturer/vendor doing the tweaks, mind you, not clueless me (I wouldn’t dream of touching this arcane technology I knew nothing about).

In the end we ditched the microwave and went with a good old copper link which worked without a hitch regardless of the weather.

So since you are, in your own sarcastic way, asking how I know, this is how: from experience. I don’t know about the technology but I do know about when they promise you it will work in the rain.