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A comment on Project Loon. Parent comment

Re:Project Loon by citricsquid on Saturday June 15, 2013 @12:01AM (#5883947) 

    Each balloon can provide connectivity to a ground area about 40 km in 
    diameter at speeds comparable to 3G. For balloon-to-balloon and 
    balloon-to-ground communications, the balloons use antennas   
    equipped withspecialized radio frequency technology. Project 
    Loon currently uses ISM bands (specifically 2.4 and 5.8 GHz bands) 
    that are available for anyone to use.
From http://www.google.com/loon/how/
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