Why don't the Ukies just use barrage balloons? Doesn't have to cover the entire city, just the avenues of approach or near critical infrastructure.

>Very cheap compared to interceptors or AA guns
>WW2 used steel cables, but honestly Sneedheads could be stopped with a nylon cables
>Passive, don't have to do anything but keep them up
>Sneedheads are dumb drones anyway, always come in low, predictable direction and won't be able to maneuver around a net of cables

Why wouldn't it work, or why haven't they at least tried it?