What is the maximum distance at what we can place the plasma tube from the body?

Plasma produces two related fields. The one that does the really heavy lifting is the near-field, and this extends six inches from the tube in all directions. After six inches, it becomes far-field, which isn't as effective as near-field, although it still works efficiently enough to disinfect and clear mold from a home.
So it still works on the body, just not to the same extent and power as near-field.

If you are unable to be within the near field, suggest you remain within 5 feet of the tube for decent efficacy. This is where I have most of my family when the tube is running.

I have affected targets further than this, but the field decreases in power as you go further away.

To give you an idea of the field, a WIFI router is only 1 watt of power maximum by law. You can see how large the field is with your phone. The plasma output from the Spooky2 Central is 40 watts.

This blog may give you some help: https://www.spooky2-mall.com/blog/what-is-the-effective-distance-of-plasma/

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