It is normal that television, the technological wonder which radically changed the life at the 20th century, involved the construction of l' EER higher self-supporting structure. At the end of the years 1960, horizon of the blaze of Toronto started to make devastations with signals starting from traditional turns of transmission. Signals rebounding on the skyscrapers of the city produces a certain number of problems, in particular the phenomenon obstructing of “ghosting” on the television sets. Weaker signals in competition with strongest, which gives to the televiewers the effects to look at two emissions at the same time. To improve the situation, the National Canadian or CN, construction d' proposed; a tower of transmission which would hold head and the shoulders - and then some - above higher buildings Toronto...