I had the opportunity to perform a bat survey at Sugar Grove, and a poor guard had to come out to keep an eye on us until 3am because we couldn't be left alone. We noted curious wooden gazebos positioned around a featureless meadow, hinting at significant manned infrastructure underground.
Unlike the Green Bank Observatory from the above article, Sugar Grove was piggybacked on the National Radio Quiet Zone so the NSA could intercept intercontinental telecom traffic as a part of the ECHELON network. The cover story was that it was a run-of-the-mill AT&T site, but was an open secret for all the Pendleton County WV locals that it was a spy site. The base was also home to the best restaurant in the whole county, which isn't saying much for a single-traffic-light county.