pfff Ubiquiti AirFiber 60 LR claims it can reach more than 12km when lhg60 only does 1.5 ?????
12km gives you about 150dB free space loss at 60GHz which is workable.
But additionally the oxygen will absorb another ~10dB minimum for every km.
So even in optimal conditions (66Ghz and no rain) one would have to overcome more than 250dB of loss.
Even with the maximum antenna gain and transmit power allowed in the USA one would only get -150dBm at the receiver.
Long story short: I do not believe Ubiquiti can actually achieve 12Km at 60Ghz. Most likely they just Fall back to 5GHz.