The old stuff works great, FCC put restrictions on lots of the modern gear but it has nice features like tons of notch filters and falling raster wideband displays.
I used to listen in on cellphone conversations on old gear.
Humorous what people think is secure.
♪♫ whistling in the dark, whistling for a friend... knock knock..
https://www.youtube.com/watch?v=jlB_oYqdjXY