Watch Dogs guide: Where to find all the ctOS Towers

In Watch Dogs, the city of Chicago is under the constant surveillance by the ctOS monitoring system. This guide will take you to all 13 ctOS Tower locations, and shows you how to hack your way to them so that you can install backdoors onto them. Doing so earns you the Clear Signals trophy/achievement and reveals the locations of all collectibles, side missions, hideouts and fast travel points in Chicago. A powerful advantage for any hacker.