What is the most deadly job in the US? This article suggests cell tower maintenance.
See:
http://www.rcrnews.com/apps/pbcs.dll/article?AID=/20080709/FREE/539166731/1098&template=printart
See:
http://www.rcrnews.com/apps/pbcs.dll/article?AID=/20080709/FREE/539166731/1098&template=printart