The issues of unwanted RF (Radio Frequency) emissions are unfortunately enormous with Bare-Rife systems. EVERY possible precaution and effort should be made to eliminate as much spurious emission from “escaping” as that is energy which is NOT being delivered into the tube itself to excite the plasma …but rather being given off as conventional EM (Electromagnetic) radiation …. which typically interferes with radios, TVs, various appliances, and even/especially human metabolism in an undesirable way.
Via careful and diligent tube wrapping, the maximum amount of power can be focused/delivered to the interior of the tube minimizing the undesirable, (often illegal !!!), spurious emissions. With good workmanship, good materials & proper tuning, good performance and good results CAN be obtained.