Hi J-P
I only suppose that the electrostatic field is curved, I think that scientists don't have noticed this fact also because perhaps they have meausured only the amplitude of the field and not the direction or they have not judged important little differences in amplitude. The E field is a vectorial field and when we move horizontally the coil it change the angle the coil is pointed and a signal appears if the lines of force are oriented not with the same orientation in various point around us at the same height. About ground battery I think that also 1 volt or less are easly detected by the pistol because the gain is very high and the voltage of the battery only distorts the lines of force without loss of power. I don't think that the PD is a VLF loop transmitter and receiver but rather a metal detector. It's no necessary that a wave goes some meters far, the PD detects at few inches a distortion of the lines of force: the distortion of the field goes 10 or perhaps 20 meters away.In the same manner a change in the inclination of a stiff cable it can be measured at every point of the cable.
Best Regards
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