John Smith wrote:
1) Does a .0001 Hz signal use photons? A .001 Hz? A .01 Hz? A .1 Hz? A 1
Hz? I mean, at what "magical point" do photons become involved?

Already answered. Any time electrons are accelerated or
decelerated, photons are involved. Any frequency of AC
can provide electron acceleration and deceleration.

2) What experiment(s) have "seen" these photons? A fogging of film
emulsion? ???

Process of no-brainer elimination: Nothing else besides
photons can travel at the speed of light in a transmission
line (adjusted for the VF of the medium).
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73, Cecil http://www.w5dxp.com