What IS That Thing?

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What do Wrigley Field, large white disks and Federal Signal have to do with each other?  WTTW Chicago's Geoffrey Baer answers this question from a viewer who wonders what's up with that weird object in left field. Watch the video from 6:03-7:19 to find out what IT is. Visit Federal Signal Alerting & Notification to learn more about our modulator siren.