Comment by MrGilbert

Looks like several of these have come up in the past months, with the last one being a real product (that was on pre-order)

- https://makerworld.com/models/2872376-esp32-plane-radar-live... (referenced by the linked article)

- https://github.com/AnthonySturdy/micro-radar

- https://www.gadgies.co.uk/shop/p/product-3-szb2y-gzh2r-tzhkx...

Personally, I really like them. It's a nice gadget. :)