Today’s Investment of the Week is a company benefiting from another kind of revolution sweeping the world—the communications revolution. An estimated 60% of the world’s people now own cell phones, according to a report from the United Nations. The infrastructure required to support that many cell phone users is colossal, and American Tower Corp. (AMT) is helping build it. Gregory Spear, editor of The Spear Report, recommended AMT in the latest Dick Davis Investment Digest, writing: “Sales of mobile computing devices soared 85% in Q4, while wired-PC sales crept up less than 5%. In the developed nations, where wireless...