Here's an example from a 50kW AM transmitter:
The Bullshit is strong in this one!
We are supposed to infer that the mast involved is connected to an active 50kW AM Transmitter.
This is not so, for the following reasons:-
(1)
The antenna is initially shorted, then when the cable is removed, an arc appears.
A Transmitter seeing a short on the feeder will turn off for a few seconds, then try again, & if the short is still there, lock itself down, requiring manual restoration.
That being so, it cannot supply power after being shorted for some time.
(2)
The arc which occurs is too small, & the "singing arc" too low level & noisy.
When I worked at a 50kW site, a favourite trick was to place a short cct between two nominally earthed points, the mast hut downpipe & the chainlink fence surrounding the mast base.
We got a nice "singing arc", (a bit louder & cleaner than the video), but it was eventually banned by the Boss, as we had burnt too much off the downpipe!
On another occasion, as I was returning from doing "mast hut readings", a distant lightning bolt caused one of the "horngaps" at the mast base to arc over.
The RF maintained the arc until it travelled up the horn & self-extinguished.
During this time, the "singing arc" bellowed out the Football results at a similar level & quality to a large PA system----much louder than in the video.
My suggestion is that the mast he is playing with, is in fact,disconnected from any Transmitter, & the RF appearing at the feeder is pickup of the signal from the active antenna.