Starting to see more & more of this with drones. In some cases, it's for military to detect drones nearby. In others, it's being used by drone delivery compan

Starting to see more & more of this with drones. In some cases, it's for military to detect drones nearby. In others, it's being used by drone delivery companies to detect other planes in the sky in a way that is cheaper, works in low-visibility, and doesn't use the same power requirements as radar.