As recent activity sessions have shown, FT8 on 2m and 70cm can be very effective. Although many QSOs are due to tropo, I am convinced that some sort of scatter is often involved.
This maybe aircraft scatter or troposcatter. With FT8, scatter is possible with far smaller stations. It would not surprise me if scatter was more likely as the frequency is increased. It might be very effective at 23cm or higher with FT8, although I have no evidence.
If I had 23cm FT8, I might try some tests.
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