Eric Clark / for the Chicago Tribune
Chicago firefighters use a ladder basket to rescue a worker Thursday from a cell phone tower at 77th and State streets. 
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Firefighters rescued a worker who was dangling from a cell phone tower in the Chatham neighborhood after slipping off a platform, officials said.
Two workers were doing maintenance on the tower at 77th and State streets near the Dan Ryan Expressway around 6:15 p.m. Thursday when one of them lost his footing, according to Fire Department spokesman Larry Langford.
The other worker alerted emergency responders as his partner, wearing a safety harness and gear, hung suspended 100 to 150 feet above ground, Langford said.
Firefighters responded with an aerial ladder rig.
