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It is a well known fact that 90% of Chicago
FM, TV, and Cellular are broadcast off of sky scrapers. The best known of these sky
scrapers is the Sears Tower.
Sears Tower also holds a lot of
Chicago's local communications such as the trunked police/fire/emergency freqs.
All of Chicago's TV stations have DTV space from here. It is unknown exactly
which or how many FM bays are in the two towers. If anyone has any info or a
list of what is up there feel free to email me.
A second popular broadcasting
spot is the John Hancock Building.
Eight Major Television
stations and 12 FMs come from the twin 390 foot tall towers on the top. Over 100
two-way radio systems operate from the rooftop antenna grid, and over 50
microwave systems provide signal reception from all sorts of businesses. I
believe that there are also celluar bays on the bottom.
There are
hundreds of other skyscrapers in Chicago that include some form of radio
transmitter.