HERE IS YOUR FREE ENERGY. HANDLE WITH CARE.

[JackH]

Well I hate to say this, but radio waves are not free energy.  Thay need to be sent out over the air by a powerfull transmitter.

Later,,,,,,JackH

[0ne]

The Earth, and the Sun and the Stars are "radio" transmitters.

[Mr.Entropy]

As an energy capture device, this sort of thing is known as a "rectenna" (googlable).  There is, unfortunately, no type of rectenna that works for all frequencies, because many features of antenna design are somewhat frequency-specific.

The most common use is for microwave power transmission.

Cheers,

Mr. Entropy

[Localjoe]

@ Rosphere and All
Correct me if I'm wrong but, The crystals in the earphone for the crystal radio probably work well for the wavelength range a crystal radio covers or can tune in. So the next question arises in my head.... what determines or receptivity in those crystals... is it size, shape, moculear resonate freq ? If we could find the math to determine what size shape ect crystaline structure would be optimal for say the sun or a number of other sources of radiant energy around us. It may be possible for those sources to vibrate crystals designed made whatever to be affected by the wavelength span we'd like to receive
                                                                                                    Joe

[nightlife]

I believe a crystal is matched to a frequency by finding the frequency that created the crystal and vise versa.