Because conditions vary so much, it is not possible to make sweeping statements about antenna effectiveness however I can draw some impressions.
Judging by my experiments on 472kHz last night loading up the 2m big-wheel and feeder, I have concluded that the earth-electrode "antenna" in the ground works as well. I am sure a much more efficient 472kHz antenna can be made but, looking at compromise antennas the earth-electrode "antenna" is not at all bad. I suspect this works as a loop.
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