(Reuters) - Cellphone tower operator SBA Communications Corp will buy 3,252 tower sites in the United States and Puerto Rico from privately held TowerCo for about $1.45 billion to take advantage of explosive growth in data traffic from users of mobile devices such as Apple Inc's iPhone and iPad. SBA, which has a market value of $6.64 billion, is the smallest of the three major U.S. tower companies but it is growing quickly as competition among existing participants is limited and entry barriers are high. The purchase, for $1.2 billion in cash and 4. ...

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