With a market cap of $103.1 billion, Boston, Massachusetts-based American Tower Corporation (AMT) is a global leader in the communications real estate industry. It owns, operates, and develops over 224,000 communications sites, providing multitenant infrastructure solutions for wireless carriers and network providers worldwide. The company is expected to announce its fiscal Q3 earnings results before the market opens on Tuesday, Oct. 29. Ahead of the event, analysts expect the wireless communications infrastructure company to report a FFO of $2.50 per share, down 3.1% from $2.58 per share in t…