These are very small RX antennas that can be very effective at VLF, LF and MF. As you move HF, they get less effective. The main issue is that at lower frequencies external noise dominates.
There are several designs around. Important factors are dynamic range (they can be hit with some very strong signals) and positioning away from buildings to minimise noise pick-up.
See https://sites.google.com/view/g3xbm4/home/antennas/e-field-probe-efp .
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