where is the signal???

[Alexismex]

Where is the signal for Gold hunter???:
A quiet day
In a "normal" day we can usually receive these signals:

1) 50 Hz main frequency, always presents, everywhere
2) 50 Hz signal changes in intensity in the time
3) 100 Hz (50 Hz x 2) changes direction in the time
4) some tones travel as LSB of 100 Hz tone
5) a weak static
6) noise coming from mains: it appears as AM modulation of 50 Hz tone: upper part is specular to lower part
7) same kind of noise of point 6: two different colors identify two different source direction
too strong to be a static: probably a mains stroke
9) a green hiss below 10 Hz: its amplitude is correlated to 50 Hz tone intensity, then brought by mains

Thank you for this fantastic Vlf site with many many interesting Vlf research and perhaps LDR answer!!!

http://www.vlf.it/rdf_gallery/rdf_gallery.html