That is the field type used by doctors when they used the original Rife machines. They found that beyond several feet the results were not so good. The signals can still be detected but the field starts turning into far field. 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.
Source: Spooky Central Q&A