usually these are either under a military base on on a military base underground or near one way out in the middle of nowhere usually but there's always expetions to the rule as they launch cloaked anti-gravity spacecraft from at least 1 air force base in florida so lol
35.889355 , -117.671350 - picture from this one
35.886048, -117.672037
35.853862, -117.654545
35.900940 , -117.721733
35.993639 , -117.612059