Chopper 7 captured the process.
Another helicopter lifted the 5,500-pound, 32-foot antenna up to the top of the skyscraper, where a daring crew waited to install it.
Chopper 7 captures installation of new antenna atop Willis Tower
More viewers will now be able to watch ABC7.
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Broadcast Operations Manager Conlan Fay said the antenna allows ABC7 to broadcast its signal farther and improve quality.
Some of the ABC7 Chicago team signed the antenna before it was lifted atop the tower.