Interpretation
At 1 MHz the host attenuates 0.46 dB/m, giving a practical hole-to-hole range near 237 m; the conductive zone adds a measurable 60.0 dB shadow.
Host attenuation
0.463 dB/m
Anomaly attenuation
4.216 dB/m
Wavelength
122.39 m
Max range (110 dB budget)
237 m
Shadow contrast
60 dB
Received level vs distance
The gap between the curves is the radio shadow cast by the conductive zone.
Attenuation vs frequency
Choosing the operating frequency is a direct trade between range and resolution.