LES1 has been in orbit for 46 years. Although abandoned long ago, it still transmits at 237 MHz every four seconds as a result of its tumble. Nice project for amateur radios guys.
http://www.southgatearc.org/news/february2013/radio_archeology.htm#.UgafkL4o6Uk
http://www.southgatearc.org/news/february2013/radio_archeology.htm#.UgafkL4o6Uk