Since the recent Mexico sightings a mysterious signal has been heard
worldwide on the SW band. It is audible worldwide and is being
broadcast with  considerable power. This may be a one way transmission
to extra terrestials. Radio buffs are in a spin as it is definitely
unlike any known transmission. Sounding rather scary, the best way to
describe it is a couple of whales talking to each other.
Attempts to ID the signal have failed and the belief is now that the
US are trying to communicate with out almond eyed grey friends..
Tune your SSB receiver to 10.512 MHz. (upper side band)  It is very
strong in the evening in Europe. You can't miss it!