I heard about people getting amalgam (metal) fillings in their teeth and receiving radio signals. I do not know if that is true, but it is neat to think that could happen.
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Its impossible. Any radio signals that are transmitted have been bound to a carrier signal to make them go further. Its possible that metal fillings can resonate with radio signals but while it is modulated there is no way the person would be able to hear anything apart from static or soemthing like that.
Actually, this is well-documented, and in at least a few cases cannot be explained by any other phenomenon like temporal lobe seizures. It appears the circumstances have to be precise (even to the bone structure of the victim to properly amplify the resonance) but it's possible under the right conditions. That having been said, I have no idea what this question is really asking. My first impression was that you were somehow in your garage cramming electrodes into your arm and exciting them with vacuum tubes to make your muscles twitch when someone gave call signs. I've heard of radio being in your blood, but come on... (buh-duh TSSH!) Anyhow, perhaps some clarity in the question will get better answers, as they seem pretty varied so far.
I think the answer is that you use your nervous system to drive your muscles to buy parts to assemble a ham radio receiver.
. Try this Google search: http://www.google.com/search?q=singularitarian . Some of those ppl are working with machine-brain interfaces.
Depends on what you want to do. It'd be easy to just plug into a human and feed the amped output and maybe get a tingle which could be a signal to do something and in that case you've actually done what you wanted to do, but it's pretty limited. If you want a more sophisticated system then that's going to be much more complicated.
Given the size of a "ham" aerial, I doubt it would be practical...
Odd question... The only thing I have ever heard of somebody doing something like that was in an issue of Popular Science, they were inserting radios into a mouses brain to control its motor functions. But that was not applied science, they were testing to see if it was possible and the tech is still under review. What are you doing that you want to know?