Thanks to Amateur Radio Weekly, I came across a recent contact on the 10 GHz band that took place between the states of Tennessee and Virginia in the United States.
The video shows a successful contact on FM between N4OFA in grid EM86RS and K4LY in grid EM85WB. The distance was about 190kms or 120-miles which on FM over an obstructed path is impressive.
I looked at the path profile and it seems that the most likely mode of propagation was knife edge diffraction over the mountains in between.
It was curious to note the QSB (fading) on the signal as well. Reason? Vegetation moving? Some aircraft scatter?
In the video description, Mike N4OFA writes... "This is a video that amazed both of us, signals were very strong, I found Doug's beacon where he was portable near his house. A quick touch up with my wonderful tripod and he was hitting S9 with quick QSB. What kind of propagation is this? Doug's FM signal sometimes hits S9 on my little FT817nd. Note: no elevation on the dish at all, no rain cells between us. We did not try CW as there was no need since we could carry on a conversation even on FM."
See video below...
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