Small coils (about 5 to 6 inches) separate targets in trashy parks and reach tight spots. Standard coils (about 9 to 11 inches) balance coverage and separation. Large coils (13 inches and up) cover ground faster and reach deeper on larger targets but struggle among trash. DD coils handle mineralized ground and give a wide sweep; concentric coils pinpoint well in mild soil. Coils only fit their own detector models.
The coil is the part of the detector that touches the ground. Changing it can transform how a detector performs.
Sizes
| Size | Strengths | Weaknesses |
|---|---|---|
| Small (5 to 6 in) | Separation, tight spots, light | Less coverage |
| Standard (9 to 11 in) | Balanced | Jack of all trades |
| Large (13 in and up) | Coverage and depth on larger targets | Heavy, struggles in trash |
Designs
| Design | Notes |
|---|---|
| DD | Wide sweep, stable in mineralized soil |
| Concentric | Cone-shaped field, precise pinpointing, mild soil |
| Mono (PI) | Used on many PI detectors for depth |
Compatibility
Coils are built for specific detectors and frequencies. Check the maker’s list.
Headphones
Good headphones reveal faint signals and save batteries. Choose waterproof models for beaches and wireless only if your detector supports low-latency pairing.
See pinpointers to complete your kit. Browse pinpointers and tools.
Common questions
Does a bigger coil go deeper?
On larger targets in clean ground, usually yes. On small targets and in trash, a smaller coil can find more.
What is a DD coil?
A coil with two overlapping D-shaped windings, giving a wide, even search pattern and stability in mineralized ground.
Can I use any coil on my detector?
No. Coils are model- and frequency-specific. Use the maker's compatible coils.
What coil is best for trashy parks?
A small coil, which separates good targets from nearby iron and trash.