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> yes I know you can theoretically detect receivers through signal attenuation but at these distances it’s effectively impossible to do

Well if that's part of your threat model then you should also consider the RF put out by the motors. Remember the part where we densely blanked the inhabited parts of the world with highly sensitive antennas over the past 3 decades?

 help



Yeah, spark of engine is something what can be seen on SIGINT for dozens of kilometers.

So unless jet engine is used (which rarely is on reconnaissance drones) then the drone will be spark lighthouse in the sky.




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