This paper discusses a prototype that will harvest available RF waves in urban areas especially from 700 MHz to 6 GHz. The harvested energy, which of very low magnitude, is later amplified to a suitable value for the use in consumer appliances, especially for mobile devices. It will increase the mobility of the device and allow to use the unused electromagnetic wave for daily purposes, thus reducing the pressure on national power grid in a broad sense. In addition describes efficient methods for extracting DC power from electromagnetic radiation.