There is PDF buried in the developers section that says that they can get 100µW with a single antenna and multiple antennas can be combined to increase the powe

There is PDF buried in the developers section that says that they can get 100µW with a single antenna and multiple antennas can be combined to increase the power. I think a continuously powered device would not be a good application. Instead a device that powers on occasionally where the FreeVolt is trickle charging a battery would be a better application.