Table 4.

Reflection Coefficients for Typical Ground Types.

Surface	Dielectric Constant εr	Reflection Coefficient R
Dry poor ground	4–7	−9.7 dB, ..., –7.0 dB
Average ground	15	−4.7 dB
Wet ground	25–30	−3.6 dB, ..., −3.3 dB
Water	81	−1.97 dB