| Surface Type | Typical Area(s) | Dielectric Constant (Relative Permittivity) |
|---|---|---|
| Salt Water | Oceans | 81 |
| Fresh Water | Lakes, Ponds | 80 |
| Pastoral, Low Hills, Rich Soil | Dallas, TX to Lincoln, NE | 25 |
| Pastoral, Medium Hills, Rich Soil | OH and IL | 14 |
| Flat Country, Marshy, Densely Wooded | LA near Mississippi River | 12 |
| Pastoral, Medium Hills & Forestation | MD, PA, NY, Exclusive of Mountains & Coastline | 13 |
| Pastoral, Medium Hills & Forestation, Heavy Clay Soil | Central VA | 15 |
| Rocky Soil, Steep Hills | Mountainous | 2-4 |
| Sandy, Dry, Flat, Coastal | Desert | 10 |
| Cities, Industrial Areas | Small Cities, Urban | 5 |
| Cities, Heavy Industrial Areas, High Buildings | Large Cities | 3 |