A high frequency signal displays better ability to cross through sources of resistance. What is a potential drawback of using a high-frequency signal?

• A. It cannot be deflected.
• B. It cannot be transmitted through soil.
• C. It is completely absorbed by insulators.
• D. It easily jumps to a more conductive conductor nearby.

Answer: (D)

High-frequency energy has stronger coupling to nearby conductors, so it tends to take paths of least impedance. That means the signal can transfer to a nearby, more conductive conductor through capacitive or inductive coupling. The result is the energy “jumps” to adjacent metals, which can distort readings or divert the signal from the intended target. This is the main drawback of using a high-frequency signal in this context.

The idea that the signal cannot be deflected, or that it cannot travel through soil, or that insulators completely absorb it isn’t accurate—high-frequency signals can interact with many materials, and their tendency to couple to nearby conductors is the real concern.