It is easy to harvest energy from medium wave (530kHz to 1700 kHz) radio signal. If you are located close to AM radio station you can get several watts of power. which is sufficient enough to charge your cell phone and drive several LED lams.
The presentation file link:
https://drive.google.com/file/d/14f-POV83xB5mIz_QXpImGTFEvBfn91gL/view?usp=sharing
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