Car Camped on the "lower 40" on my first Near Fest, hung a wire in the trees, and at night heard the Russian "Dead Hand" buzzer on 4625 kc for the first (and only time). Not a numbers station, but equally mysterious, and somewhat scary, since as its name implies, if it goes off the air, that is supposedly the signal to nuke the USA.
Bring your R 390A or other tube receiver for free alignment/troubleshooting at Aesop Engineering.