Directional transmission isn't subject to the inverse-square law (well, sort of [1][2]), only omni-directional transmission. While I don't know much about uBeam

Directional transmission isn't subject to the inverse-square law (well, sort of [1][2]), only omni-directional transmission. While I don't know much about uBeam, there are efforts to use beam-forming to make charging more efficient, ie: http://www.scribd.com/doc/70793467/Wireless-Charging http://www.scribd.com/doc/70793467/Wireless-Charging [1] http://www.physicsforums.com/showthread.php?t=633345 http://www.physicsforums.com/showthread.php?t=633345 [2] http://www.physicsforums.com/showthread.php?t=177187 http://www.physicsforums.com/showthread.php?t=177187