This is just a quick one before I crash out for the day - NHK ran a simple demo of their ultra HD (8K, call it what you will) radio link.
Here's what it looked like, although you'll have to take my word for the sheer coruscating resolution:
Achieving this over the air is necessarily a bit complicated given the enormous amounts of data involved, and involves a couple of adjacent radio channels with further multiplexing via both horizontal and vertical polarisation. Here's the receiver stack:
Personally I'm not entirely convinced of the real practical need for 8K under almost any circumstances - perhaps as a precursor production format to produce very high quality 4K masters. Also, we've seen companies like Canon discuss the idea of shooting sports with high-res chips in order to later use the extra information to produce enlargements of crucial picture areas.
Anyway, it's nice to see that it can be done. In fact, it's just nice to see, as it is, obviously, a very unusually sharp, clean image.