TV/FM transmitter on Willis Tower - Chicago, Illinois - Radio and Television Transmitter Towers on Waymarking.com

The Willis Tower is with its 442.1 m height not only the tallest Chicago skyscraper and city's key touristic attraction, but its two from a far visible roof antenna masts also serve as key TV/FM-transmitters of Chicago metropolitan area...

[source - Description and History of the Building: Wikipedia]

"The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 442.1 m skyscraper in Chicago, Illinois, United States. At completion in 1973, it surpassed the World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 25 years and remained the tallest building in the Western Hemisphere until 2014 and the completion of a new building at the World Trade Center site. The building is considered a seminal achievement for its architect Fazlur Kahn. The Willis Tower is the second-tallest building in the United States and the 16th-tallest in the world. More than one million people visit its observation deck each year, making it one of Chicago's most popular tourist destinations. The structure was renamed in 2009 by the Willis Group as part of its lease on a portion of the tower's space.

As of December 2013, the building's largest tenant is United Airlines, which moved its corporate headquarters from the United Building at 77 West Wacker Drive in 2012 and today occupies around 20 floors with its headquarters and operations center.

The Willis Tower observation deck, called the Skydeck, opened on June 22, 1974. Located on the 103rd floor of the tower, it is 412.4 m high and is one of the most famous tourist attractions in Chicago. Tourists can experience how the building sways on a windy day. They can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day. Elevators take tourists to the top in about 60 seconds, and allow tourists to feel the pressure change as they rise up. The Skydeck competes with the John Hancock Center's observation floor a mile and a half away, which is 98.5 m lower. Some 1.3 million tourists visit the Skydeck annually. A second Skydeck on the 99th floor is also used if the 103rd floor is closed. The tourist entrance can be found on the south side of the building along Jackson Boulevard.

Many broadcast station transmitters are located at the top of Willis Tower. Each list is ranked by height from the top down. Stations at the same height on the same mast indicate the use of a diplexer into the same shared antenna. Due to its extreme height, FM stations (all class B) are very limited in power output."

Provide at least one picture of the Transmitter tower/antenna and a summary of your visit. Do you/did you watch this TV station or listen to this radio station?