Tesla did indeed transmit wireless power quite easily and with minimal power loss. He was maticulous in his documentation, and very reliable. Look up the Wardenclyffe Tower, based on using harmonic frequencies and transmiting both through air and ground (air transmition of power is poor, however ground is excellent. if people had radios that were based on recieving signals that were transmited through the ground, there would be signals that were hundreds of times better) Telsa varifiably transmited power from one side of the globe to the other with 95 percent efficiency. If you doubt this, take into consideration the fact that Tesla has over 1200 pattents attributed to him, he is the inventor and father of the modern electrical grid, and he discovered, and harnessed transverse electrical waves one hundred years ago, something which is only know on the fringe of science and is reletively unheard of by most people.