Learned to build my own .
You needed a #2 pencil , single edge razor, empty toilet paper tube, 32 gauge copper wire, a metal hanger, screw, and a piece of wood to hold it all and headphones to listen A radiator or pipe was your ground. No battery needed.
The late 50's and early 60's were legendary for . Public libraries are our friends.
Let's not forget boats powered by soap.
I get for the old daysq

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