Searching in the vicinity of a chain link fence requires a reduced Gain setting and also some control over the orientation of the locator. As illustrated in Figure 3-10, position the locator horizontally with its long axis perpendicular to the fence. This ensures that the upper sensor is kept away from the fence.
Perform the search by moving along the fence, keeping the end a constant distance from the fence. When a point 1-5/8 inches form the end of the locator is directly over the stake, the signal will drop abruptly as shown in Figure 3-11. Any variation in the position of the locator will produce an abrupt rise in the frequency in the tone.