I stopped by the site once back in the mid '80s and just talked to the guard as there was no possibility of getting in unannounced. The guard said that new people assigned to the facility often went through periods of moody weirdness because of the high RF levels. Pure supposition? In the video there is a map of GPS reference sites. The one marked "Spokane" is located here:
http://binged.it/RoFtn7.
This DGPS site was originally a part of the USAF Ground Wave Emergency Network (GWEN) but was apparently repurposed sometime along the way, perhaps because it already had a LF vertical antenna. You can drive right up to the site.