Dielectric soil moisture measurements are now widely used, both in research and in commercial agriculture. Although measurements are often made in locations where Electrical Conductivity (EC) and temperature fluctuations are low, high levels of either can cause difficulty in analyzing dielectric moisture data. Several researchers have proposed using higher probe frequencies to mitigate these effects, but there are limits to that approach, both in cost and effectiveness. The objective of this research was to determine what could be done to decrease salt, texture, and temperature sensitivity of the soil moisture probe in different soils. Sensitivity to EC was found to be considerable in both course- and fine- textured soils at low probe frequencies. Increasing the probe frequency removed much of the EC sensitivity in all soil types and appeared to diminish the need for specific soil texture calibration. Although temperature sensitivity was also changed by higher frequencies, it did not appear to improve noticeably. After testing a range of operational frequencies, optimum performance was found to be around 70 MHz; higher frequencies appeared to cause probe performance to worsen.