For the most part drones are limited by the same constraints as an RC plane in terms of radio range. It depends on the radio. My Parrot is controlled by 2.4GHz wifi so it goes as far as my phone's range, which isn't very far. I've seen people that have hacked in a household router to extend that range quite a bit, but it's still radio waves that control the drone so it's still based on how powerful your transmitter on the controller and the drone itself are.
The exception to this is drones that have GPS and that can be programmed to move autonomously to GPS coordinates.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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