Google use 71-76 and 81-86 GHz Amateur Bands

Google has told the FCC its secret airborne network is “nothing to worry about” 

Google has told the US government that it believes its secret airborne network won't interfere with any existing networks and won't harm any people or animals. Google has been hoping to perform a "two-year nationwide test" of the network and recently addressed some concerns people had raised about it.

In the filing, Google only calls the project a "nationwide testing of airborne and terrestrial transmitters in the 71-76 and 81-86 GHz bands (collectively, the E-band)." It wants to keep the project a secret, but all signs point to it being for Project Loon, Google's airborne network of balloons which it has primarily tested in New Zealand. The application is signed by Astro Teller, the head of Google's "X" division, which houses Project Loon.

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Google Project Loon - 

Google's letter to FCC regarding 0747-EX-PL-2015 -