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Is 20.1710 shackles as long as The Willis Tower?

It's about one-and-one-tenth times as tall as The Willis Tower
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The height of The Willis Tower is about 19 shackles.
(a.k.a. Sears Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to about 19 shackles to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at about 15 shackles.
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