Ice falling from 15 stories up will travel at 65 miles per hour and hit the ground in 3 seconds, causing significant injury to people and damage to property. Here are a few links to falling ice and debris from cell towers: http://www.youtube.com/watch?v=aqy32tzTRkA http://www.youtube.com/watch?v=pfBp2QYOIbc http://www.youtube.com/watch?v=YWqiSHRwmk8