Servo distance - Project Guidance

Probably in the wrong place, probably been questioned before but I couldn't see anything.

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I have an Arduino set to run a few servos, wondering the maximum distance for the servos to be from the arduino.

Cable run from control panel to servos is about 20m.

Would it be better to

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1. feed power locally and run the PWM control line to the servo at 20m? or
2. Place the arduino locally and run the switch cables (toggle switch to arduino) for 20m? or
3. Include a TTL circuit to provide the high/low signal for the switch pin and provide a control line independent of the arduino wiring?

I'm edging towards the third option to negate voltage/signal loss.

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