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Yes, it is possible to detect VLF (Very Low Frequency) signals using two rods in the ground connected to a preamplifier. This setup essentially forms a simple dipole antenna2. The rods act as the receiving elements, and the preamplifier boosts the weak signals received by the rods.

However, there are a few considerations to keep in mind:

1. Signal-to-Noise Ratio (S/N): VLF signals are often weak and can be easily drowned out by noise. A good preamplifier with a high dynamic range can help improve the S/N ratio1.

2. Ground Conductivity: The effectiveness of the rods can depend on the ground conductivity where they are placed.

3. Interference: Avoid areas with high electromagnetic interference, such as power lines or electronic devices.

Would you like more detailed information on how to set this up, or any specific aspects you're curious about?

https://physicsopenlab.org/2020/05/03/loop-antenna-for-very-low-frequency/