VOR 12025 KHz VOAAREA Plots for Japan
You may be interested in these VOAAREA plots of VOR 12025 kHz for Japan (map centered on Tokyo) valid for this month.
Conditions for each hour are different; for example, attachment 1 shows the 0300z plot and attachment 2 the 0009z.
It would be interesting to know what are the actual received signal strengths.
34°02' N, 84°24' W