An employee had replaced an antenna on a cell phone tower. As he was making his way down the inside section of the tower, he tried to make his way around an obstacle. He went to the outside of the tower to finish the climb down. The employee lost his footing and fell approximately 40 to 50 feet to the ground, suffering a shattered ankle, knee damage, a swollen right arm, and lacerations/contusions to the face. He was equipped and wearing fall protection at the time.