American Tower’s (NYSE:AMT) growth outlook remains tied to muted carrier activity, with T-Mobile US (NASDAQ:TMUS) driving colocations to meet Federal Communications Commission (FCC) buildout rules while Verizon (NYSE:VZ) and AT&T (NYSE:T) continue network upgrades that bring only incremental leasing revenue. Colocation activity has picked up, but American Tower faces pressure as Verizon launches a high-rent relocation program, targeting its largest tower landlord ahead of a key master lease expiration. RBC ...