this is the real question, why did so many towers collapse in winds that are pretty mild compared to what others can withstand. Cyclone Yasi, only 2 towers failed, and due to land slides, against 235Kp/h winds. the Snowly scheme regularly sees winds of over 150 Kmh without issue.
https://medium.com/@andynehl/why-did...6b1#.g5hedihtn