This paper proposes a novel approach to the problem of harvesting the energy of the RF spectrum. Unlike the unusual impedance matching network, the combination of a Fabry-Perot cavity with commercial Wi-Fi antennas is proposed to enhance the energy captation in frequency range between hundreds of MHz and few GHz energy of a wide band. To show the viability of the method, an illustrative prototype has been implemented and tested. The experimental measurements shows the viability of the approach. Work is in progress to combine the enhanced RF transductor with standard energy management in order to test the efficiency of a full harvesting system with load capacity up to 5.2 V.