in 1975, an Erickson Skycrane
[Sikorsky S-64 Skycrane] nicknamed “Olga”, removed the
crane which was used during construction of the CN Tower,
and then installed the antenna [the top section] in 36 sections.
http://beforeitsnews.com/opinion-liberal/2015/06/a-very-big-helicopter-for-the-very-big-jobs-2507392.html
Above is the view from the observation deck of the CN Tower.