Ukraine and Russia are apparently building drones with fiber-optic tethers to defeat this. Like the old wire-guided missiles.
https://www.businessinsider.com/ukraines-drone-makers-produc...
https://www.businessinsider.com/ukraines-drone-makers-produc...
In the former case, you have close to zero for both. In the latter, you're dragging 2km of line behind a small aircraft, risking the line getting snagged by something on the ground.