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Maker Pro

Need help with field effect circuit

Accidently posted in this in the wrong section so I'm posting it here now.

I'm trying to build an antenna that powers an LED. I want the LED to stay off when the antenna detects no electric field. And turn on when it does detect one. I know the basics but in really confused when it comes down to the exact type of FET transitory I need. And do I need a FET or JFET. What's the difference and how would each of these work in this type of project? Thanks for any help.
 
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