How can i control to on and off the acmotor

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Are there wires/cables already in place? Such as a phone line, internet line. You could send commands over that. It would require extra equipment.

Or there is wireless communication. There are walkie-talkie systems that use public radio bands. 6km might be within reach. I suppose you would create transmit coded commands in the audio range. Then you would decode the audio signals using extra equipment where the motor is located.
 

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