WWV & WWVH (Fort Collins Colorado and Hawaii)
broadcast on 2500, 5000, 10000 & 15000 kHz with ampitude modulation providing time of day, atlantic & pacific weather information, GPS status, solar flux data, etc and if you can receive that low, 60kHz (CW) with a radiated power output of 250,000 watts to automatically set your clock, provided of course that you have the right type of clock.
Serious business men, this ain't no drill
