The scanning tip that I mentioned before for lines also works for circles. If the results of your scan yields a circle - meaning just two probes picked up the signal - then swivel around to find the point on the circle that lies farthest from your probes.
Once you found it (from the first to the second frame in the figure above, I just rotated to get a better view) move the probes to this farthest point and you can zoom in at least two levels. It will yield a much better pinpointed source and save you additional scans.
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