aqui pa la bandita que sabe ingles ahi les va que ya probaron que fue un humano el que hizo el desmadrito....
I remember it and it has been "found" (a long time ago). It was a hoax. It had been done by a human. No real extraterrestrials were hurt in the preparation of the hoax.
The original hoax was on IBA (not BBC) at 5:10 PM on 26 November 1977.
In those days, signals broadcast on TV transmitters were fed to the transmitter by landlines. The transmitter involved in the hoax was one of the rare transmitters that received its signal in the form of UHF radio waves. Thus, it was possible, using a local UHF transmitter, to overpower the system and force the antenna to broadcast an external signal instead.
Because UHF is line-of-sight only, the pirate transmitter had to be very close to the TV transmitter.
Only the sound was involved (not the picture).
The original message was something like:
"This is the voice of Asteron. I am an authorised representative of the Intergalactic Mission, and I have a message for the planet Earth. We are beginning to enter the period of Aquarius and there are many corrections which have to be made by Earth people. All your weapons of evil must be destroyed. You have only a short time to live to learn to live together in peace. You must live in peace... or leave the galaxy."
The "Age of Aquarius" is a purely Earth-centred event (it is when our Vernal Equinox enters the constellation of Aquarius -- something which would be totally irrelevant to the rest of the Galaxy).
Interrupting the UHF signal from the station required knowledge of how that particular transmitter worked. If it had really been all-powerful aliens (capable of threatening us with being expelled from the Galaxy), they would have used their own transmitter to swamp all TV receivers.
Therefore, the message was composed by an earthling.
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A similar incident occurred ten years later (on November 22, 1987) in the USA, but it did not pretend to come from aliens, therefore no one talks about it.
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Quoted from source:
On Saturday, the 26th of November, 1977 at around 5.10 pm, broadcasts from this transmitter were hi-jacked by unknown agents who blocked the UHF audio signal of transmissions from the then local ITV station Southern Television and broadcast their own audio message, purporting to be from Vrillon, an alien from an instititution calling itself the Ashtar Galactic Command. The message, transmitted over an ITN News bulletin and a subsequent Merrie Melodies cartoon, lasted six minutes.