Because the tank conductors are thick relative to the coil spacing, the negative going portion of the curve may not always be observed.

It should be noted that the anomalies expressed in parts per million, rather than percent, for conductors that are at a depth of 2 to 3 times the coil spacing.

Without changing coil spacing, desolder L6 which connects from the ANT pad aon the final unit to the PL-259, at the final unit.

Of the two coil spacings, the 20 meter spacing was chosen because the maximum exploration depth required over the site was uncertain and the greatest depth penetration could be achieved using the 20 meter spacing.