472kHz antenna analysis

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.