>I have sometimes taken a Neon-bulb based AC voltage tester and only plugged
>the one lead into the hot side and left the other side floating in the air.


The older radio amateurs - the ones from the era before the standing wave
ratio meters became polular - tuned the output stage of a transmitter by
holding a neon lamp with one end near or touching the antenna.
When brightest tuning and loading was optimal....

VK2GWK - HENK
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