EBENSBURG, Pa. -- A worker died after falling about 90 feet from a cell phone tower on the campus of a high school, the Cambria County coroner said.

Michael Sellers, 25, of Lebanon, was climbing the tower to install an antenna when the accident happened shortly after 10 a.m. Friday, Coroner Dennis Kwiatkowski said.

A second worker on the ground was feeding up safety rope, Mr. Kwiatkowski said.

"The initial climb is always the most dangerous until they get all the safety lines in place," he said.

Mr. Sellers wore a harness, but it was impossible to hook it on to the tower while he was climbing, Mr. Kwiatkowski said.

Mr. Sellers, an employee of Sting Communications Inc. of Lebanon, was pronounced dead at the scene.

The tower is on the campus of Bishop Carroll High School, about 70 miles east of Pittsburgh.

The U.S. Occupational Health and Safety Administration will begin an investigation today, said Ed Selker of OSHA's Pittsburgh office.