Here's a collection of signals captured with a "grabber" consisting of an amplified whip antenna above my roof, an HP3746 selective level meter, and an FFT program called "Argo." In most cases I'm guessing the identity of the station. Also see the current grabber capture.

11.902 kHz - little dashes a couple of minutes in length from Alpha station.

40 kHz, JJY in Fukushima, Japan

66.666 kHz, RBU in Moskva Russia (should be 0.666 Hz high)

I'm thinking this is DCF77 in Germany at 77.5 kHz

This is clearly the TDF signal from France. I can even see the rather weak 1 Hz sidebands from the weak modulation.

And the BBC station at 198 kHz is easily seen.