Second method of static discharge is by using the internal Balun. On the back of the ATU are the balanced outputs (the two red terminals). Jon (G2FHF) uses these to control the static build up.
The black terminal is the long wire connector and is linked externally to one side of the balun. The other side (the second red terminal) is grounded. This gives a direct path to earth. I have not used this method but it similar to the "auto transformer" I was tiring to use in the first few attempts with just a single coil.

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