In my estimation, the untreated pyramids attracted EMR for adsorption affecting the adjacent cable for up to a meter. Assuming the copper rejects or reflects the EMR, the only shungite surface in play is the one sandwiched on top of the cable or Shumann generator, or connection.
Ok this explanation is only half of the story....
The "golden plates" act also like a passive filtering device and not only like a passive shield, all along their location in the grid...
Experiment:
Take an agate, a black tourmaline, or a big herkimer diamond or a chunk of ordinary quartz....Put one of them glued to this golden pyramid on the connector...
You will observe a kind of filtration by the structure of the minerals working on some different frequencies linked to the stone chosen... ....
An agate will give a more expressive mid frequencies and some bass, a quartz will give more in the high frequencies, an herkimer diamond will do like the quartz but better.... The black tourmaline will act in a little higher level of frequencies than the agate and may improve on it....
You can try Kambaba jasper, that will work on the imaging....i will not gives all possible experiments.... I have try many....
My point is: these shungite+copper or "golden plate" does not only shield but filter in some way the line, decreasing the noise floor level by some kind of filtration with an effect that change if we change the stone....
then : shungite+copper+ herkimer diamond or tourmaline or agate etc = some shielding and some filtration....
I am sure now to be treated like a nut against an another nut..... :)
