GPR signal dissipation with distance from the source is not uniform. Which description best matches this behavior?

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GPR signal loss with distance is not the same rate everywhere because the subsurface is varied and complex. The electromagnetic wave travels through soils and rocks with different conductivities and permittivities, hitting layers, boundaries, and scatterers that change how quickly energy is attenuated. Because these properties change along the path and with frequency, the amount of dissipation varies with distance rather than following a single, uniform pattern. So the description that best fits this behavior is that the dissipation is not uniform. The other options imply a constant rate, a simple linear increase, or an abrupt drop to zero, none of which accurately reflect how real materials and wave paths affect attenuation as distance grows.