Unshielded Wire Pair -- Free Space
Separation is the distance in meters from the center of
wire 1 to the center of wire 2.
Separation must be greater than the sum of the radius of
wire 1 and the radius of wire 2.
Wire 1 is the upper conductor in the Main Screen
diagram. Wire 2 is the lower conductor.

More:
Unshielded Single Wire -- Ground Plane
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