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As long as a radio signal is shooting from one place to another through space, it's

a wave of electromagnetic fields. Once it hits an electrical conductor ... like a piece

of wire that happens to be part of an antenna (aerial) ... the electromagnetic fields

set up a small electric current in the conductor, and the signal has been "captured".

That small electric current runs directly into electronic equipment that's used to make

the current stronger, pick out the one single frequency from all the hundreds or

thousands of separate signals that have set up currents in the antenna as they

passed by, then make that one stronger again, and eventually strip the information

from it, and use the information to reconstruct the sound of a song, the voice of

a newscaster or a cellphone caller, a TV picture, the data off of the Wifi in your

house, or the data from ten different satellites for the GPS unit on your dashboard.

One of the primary goals of the art and science of antenna design is to squeeze

the maximum antenna current out of that incredibly weak electromagnetic signal

as it flies by.

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14y ago

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