Tried to work Adam VK4GHZ/P at Mt Coot-tha this afternoon on 10GHz, using the VK4OE 'three-in-one' box.

I thought this would have been an easy contact as I can see the tips of the TV towers from the driveway. But not a trace heard of each other.

A quick terrain profile was run, showing a potential reason why.... what I believe is one of the slopes from Mt Enoggera is right in the path!

By running the profile with the antenna at this end elevated to 50mAGL, the path becomes LOS (hence why I can see the tops of the towers).... but it still doesn't explain why absolutely no signal was heard, as over 14.4km I'd expected that we would have heard even a weak carrier. But then again, this is part of the challenge when operating on 10GHz!