A "real" solution against FPVs is yet to be found.
EW work to some extent, but are limited by the wave length used. And then there is the question of powering such EW systems.
Fiber-optic FPVs are impervious to such systems.
Cope cages and nets, along with layered ERAs, are only temporary measures allowing for a few extra seconds/minutes of survivability. In a battlefield, such as Ukraine, where areas are saturated by drones to the point of having one drone filming a vehicle from a few meters away while PFVs hit the target one after another, such hard covers can only last for so long.
And that's without taking into account the "luck" factor.
Mobile units have that going for them: mobility. Though it only can only get them so far, it can allow them to evade to some very broad extent.
Static units however have also that going for them. Being static allows them to rely on concealment, greater/sturdier cover, more extensive countermeasure capabilities.
But, like mobile units, it makes them vulnerable to attrition.
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