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815.20 shackles is about 40 times as tall as The Sears Tower.
In other words, it's 42.40 times the height of The Sears Tower, and the height of The Sears Tower is 0.0236 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to 19.20 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 15 shackles.
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