I was just thinking about this earlier today a little
Back in the '70s I had a crystal set going. I swapped the germanium diode with a LED and it worked for reception plus the LED lit. I then put a neon bulb on and lit that.
I had this running continuous for years until lightning fried my wire antenna. Stainless steel wire strung between trees about 150' of wire 20' up.
The tuned signal helped the brightness I think. I was thinking maybe various inductors at different frekes in parallel might be able to pull more power.
The trees are gone now, but there is still steel shrapnel around the yard.
