mr3p 16 gauge is pretty small for a
200 ft run. Even at
14ga for 200ft and 24volts at 4amps (if you are using an old-school analog sat receiver for positioner, it's likely 24volts), it would be around a
4~ volt drop. IF your dish is a large one, you might have issues with that. I'd
seriously consider using 12/2 landscape burial cable for the motor, and separate shielded cable of at least 16 gauge for the sensor wire.
IF you have a wife that likes gardening and uses a shovel, you'd also be WELL advised to put the cable inside of black coiled flex pipe...