"So many drones patrol the skies over Ukraine’s front lines — hunting for any signs of movement — that Ukrainian and Russian troops have little ability to move on the battlefield without being spotted, and blown up."
Would anti-drone drones do anything? (I think not: should inf'y attempt to advance under their cover, being spotted at all probably invites incoming att'y)
Yep. https://en.defence-ua.com/weapon_and_tech/drone_carrier_quad...
The drone carrier also acts as a radio relay, the other big thing limiting FPV range, since they both have to use low gain omnidirectional antenna and also operate very low to the ground, which is terrible for reception range.