Why try and solve this with a single installation? Create a small town out in the middle of nowhere and give it a small number of businesses and residences, all Project-owned, that combine to explain the needed traffic. Have a regional trucking company or other distribution center. to explain trucks going in and out. Perhaps have some kind of communications company that uses the low-noise region to test different antenna technologies, to explain the antennas.
Then run a tunnel a few miles away to the actual Base, housed in an old mine or some such. You could do all pre-war operations through the tunnel, and open the PB main doors from the inside with hydraulic rams when it is safe to do so.
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