Following up on original post (thanks again for interesting stuff!), I
noticed some other sites to the east of PYD, nearer to Groom Lake:

Several tall masts and unidentified things at 37.2427 N, 115.8919 W.

A radar at 37.2288 N, 115.8823 W.

Unidentified things at 37.2422 N, 115.8659 W.

Anybody know what they are?