Strange hi-jacking braodcast in 1977 video

[Stevo]

Here is the vid on youtube - http://uk.youtube.com/watch?v=thfL9hZW3uM

Tell me what you think? It is very strange as this so called 'Alien' has tooken over the broadcast signal!

In my opinion I think it is a hoax, although is must of bin very very difficult for that person/being to be able to take over the broadcast ><