Top 100 U.S. Tower Companies, Updated List

According to Wireless Estimator, the total does not include foreign-owned tower portfolios.
In some cases, the tower company might not own the structure but has lease rights and the
ability to acquire the towers after a set period of time. Totals do not include DAS or small cells.

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http://wirelessestimator.com/top-100-us-tower-companies-list/