The minimum recommended distance between the two units is 6 feet. Try to keep at least 2 feet away from the Transmitter and 1 foot away from the Receiver. There is theoretically no limit to the maximum distance between the two units. The further apart the two boxes are, the bigger and stronger the scalar field is.
For more details, please check this link:
https://www.facebook.com/groups/spooky2scalar/permalink/650141792226049/