VIDEO: Daring mission as Chicago goes digitalAn analogue TV antenna which has adorned the top of Chicago's Willis Tower since 1982 has been removed by a helicopter.
Source: VIDEO: Daring mission as Chicago goes digital (http://www.bbc.co.uk/news/world-us-canada-18776112#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa)