Modifing (nRF24L01 Module) Or (HC-11 Module) to long range and incrypting its signal

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2.4GHz range of 10KM - 30KM is not possible. Can you imagine the intensity of the signal, I am not even sure of the health issue at that magnitude. Perhaps away from human population and with a line of sight Antenna it might be.

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I understand your problem and I have an experience of wireless communication modules. Especially in RF transmission and receiver.