That said, Lubbert advises that smaller sized coils have their uses, specifically in wooded areas, because it’s simpler to get among twigs, grass, and weeds with a more compact head. Larger coils can theoretically detect objects which are further underground, However they’re also a lot more vulnerable to electromagnetic interference https://germanyinsights.de/top-features-to-look-for-in-a-modern-metal-detector/