First, make sure your location is within range of your router and is in a sunny location.
It should be placed in soil that is moist, but not oversaturated. If it has not recently rained, we recommend pouring a gallon of water over the location and waiting 2 minutes before insertion.
The sensor will achieve the best results when inserted in a single motion, taking care not to wiggle the sensor back and forth.
Be sure that less than 1" of the metal shaft is showing above the surface of the soil.