The Italian government has approved a new frequency allocation document, so I checked which changes would impact the amateur radio world. I also looked at "our" bands in the GHz range and I saw we share 77 GHz with many other users.
Since I was "lucky" with 24 GHz radars, I hopped to the usual Chinese online marketplaces to see what they sell on 77 GHz.
It turns out that 77 GHz are currently used in automotive radar sensing and of course there are modules for sale.
Looking at pictures I identified a product name: Continental ARS-408-21 Radar. There is documentation on the Continental Engineering website (they also have other 77 GHz radars), so it could be adapted for a simple HAM RTX without too much "guessing". They claim to be able to detect objects at 1200 meters, much more than my 24 GHz radars.
So, probably simple but not cheap, though! These modules are currently (2022/09) selling at 80€ each, so I will just observe how the market evolves and prepare in case their price drops.
