I recently learned that active protection systems have really significant electronic signatures. I’m no expert but I believe that they rely on vehicle mounted radar systems to detect incoming fire.

Take a look at this graphic:

https://sites.breakingmedia.com/uploads/sites/3/2021/07/imag...

The source for this is an advertisement for a Rheinmetal brand APS. So treat it like you would any marketing material.

Nonetheless, if it’s even remotely accurate, I would not want to be part of a tank crew that is visible to surveillance aircraft multiple countries away.

I get the impression these APS systems were designed with low intensity “anti-terror” operations in mind. They’ll do a decent job killing an RPG fired from across the street but they light you up like a Christmas tree. Not a problem if you’re battling ISIS but a significant liability against opponents with modern surveillance capability. Also they’re useless against top attack munitions which seem to be remarkably effective in Ukraine.