[nreilly]

TransferFi [1] has commercial wireless power transfer products. Comparing the two, this commercial option gives 42% efficiency [2] at up to 25m.

[1] https://www.transferfi.com

[2] https://www.transferfi.com/s/TFI_Sense_WPN_Spec.pdf

[SigmundA]

42% is RF to DC conversion efficiency, absolutely no way those omni antennas are end to end dc-rf-dc 42% wireless transmission efficiency at any distance, its going to be many orders of magnitude worse.