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EMP or ElectroMagnetic Pulse Transformer (EMPTy) bombs are not directed, not a great choice unless you want your house to go dark or you live in a yurt. Usually those are deployed in the air to quiet the neighborhood below.
High Energy Radio Frequency (HERF) or Tesla guns can be ground based and as a directed energy weapon they can be a lot less powerful and be very effective, especially against a commercial drone. They don't disrupt communications between the drone and controller like others have discussed but instead create voltage spikes and sparks that can disable the electronics on the drone itself. think fry the camera, fry the communications, fry the controller circuitry all at once.
Most stuff is shielded nowadays to prevent even small spikes but I doubt they are putting any of it in cheap drones. And even if they did, it's counterproductive to shield communications back to the controller so there will always be an achilles heel.
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