The Las Vegas Anomaly

It seems all the iPhones as part of the once-unknown location tracking log all have visits to locations in northwest Las Vegas, all at the same time. Alasdair Allan and Pete Warden at O'Reilly Radar have dubbed this "The Las Vegas Anomaly", an elegant turn of phrase that will undoubtedly be incorporated into science fiction stories just as soon as writers get wind of it. Speaking as someone born and raised in Las Vegas, I have no clue why those locations are listed. There's not that much between the Kyle Canyon and Lee Canyon roads on US 95. A golf course, a small park, and scattered homes.

KXTA: the old Area 51

KXTA is a TV station in Dallas, was formerly AM radio stations in Los Angeles and Centerville, UT, and is now the airport code for the nonexistent Area 51 aka Dreamland aka the Ranch aka Groom Lake.

Groom Lake aka Area 51 aka The Ranch

Be amused that a 1989 report on the containment of radiation from underground nuclear tests from the Office of Technology Assessment, a moribund Congressional office, casually mentioned that there was a monitoring station for accidental radioactive releases from the Nevada Test Site at a classified non-existent location. They also mention the sensitive Tonopah Test Range on the map. Those wacky Congressional Reports!

The Containment of Underground Nuclear Explosions (PDF)
It's on page 69.

You can visit any of the community monitoring stations, and I recommend it if you are ever in any of the towns. In Las Vegas it's located in the parking lot of the Atomic Testing Museum, at Flamingo and Swenson.