Best for difficult ground
Best Small Coils for Iron-Infested Sites
Quick answer
A large coil covers more ground and adds depth on bigger targets, and a small coil resolves two close targets and separates a good signal from nearby iron. The Minelab EQX 06 Coil (6 inch) at $225.00 is the standard small coil for Equinox and X-Terra Pro machines, and coils are machine-specific, so a coil bought for one brand will not fit another.
Coil size is the single biggest variable most detectorists never change after buying their machine, and it is often the cheapest way to transform results on a specific site. A large coil samples a bigger volume of ground per sweep, which is exactly what you want in an open field and exactly what works against you on a site where trash sits close together. A small coil samples a narrower, more concentrated volume, which costs you coverage but buys back separation: two targets an inch apart give two distinct tones instead of one blurred one, and a good signal sitting beside a nail stops disappearing into it.
The trade runs in the opposite direction on open ground, which is why this page has a sibling rather than trying to cover both cases at once. The large coil page is the inverse of this one, and reading both before buying a second coil is worth the ten minutes it takes.
Top pick
Minelab EQX 06 Coil (6 inch)
Minelab publishes the EQX 06 as a Double-D coil built specifically for high trash areas, very sensitive to small targets, waterproof and fitting the Equinox series and X-Terra Pro, at $225.00. It is the most widely owned small coil in this catalog's machine base.
Price was accurate when this page was compiled and changes often.
On this page
- Why does a small coil find more in iron, not less?
- Beginner: the manageable elliptical compromise
- Intermediate: the standard small coils
- Expert: the narrowest and most surgical options
- How do the small coils compare by machine family?
- What else changes on a trashy site besides coil size?
- How do you actually swap a coil without damaging the connector?
Why does a small coil find more in iron, not less?
It sounds backwards until you think about what "coverage" actually costs. A large coil's electromagnetic field spreads across a wider area of ground with every sweep, which means it responds to everything inside that footprint at once. On a site where iron objects sit every few inches, a large coil's field usually contains several of them simultaneously, and the machine reports one combined, confused signal rather than several distinct ones. A small coil's narrower field is more likely to contain just one object at a time, so the signal you hear corresponds to something you can actually identify and dig with confidence.
Coiltek makes this trade explicit in its own listing for the Coiltek 10 by 5 NOX Search Coil: an elliptical shape built for manoeuvring tight spots and detecting in high trash areas, offering superior sensitivity and pinpointing rather than raw coverage. That is the whole argument for every coil on this page, whichever machine it fits.
Beginner: the manageable elliptical compromise
Both picks here trade only some coverage for real separation, rather than going all the way down to the smallest coil available. They suit a site that is trashy but not extreme, and a first attempt at learning how coil size changes what you hear.
Nokta LG24 Coil (9.5 by 6 inch)
$135.99Nokta publishes a 9.5 by 6 inch waterproof DD coil for The Legend that trades a little coverage for noticeably better separation than the stock 11 inch coil, at $135.99.
Best for: Legend owners easing into trashier ground
Check price on Amazon
Mars Sniper 10 by 6 DD Coil
$112.50Mars publishes a 10 by 6 inch waterproof DD coil for the Garrett AT series that sits between the stock coil and the smallest 5 by 8 aftermarket option, at $112.50.
Best for: AT owners who find the smallest coil too restrictive
Check price on AmazonIntermediate: the standard small coils
These are the coils most people mean when they say "small coil" for their machine. Both are true 6 inch Double-D designs, built by the machine's own manufacturer rather than an aftermarket brand, and both are the most commonly owned second coil for their respective platforms.
Minelab EQX 06 Coil (6 inch)
$225.00Minelab publishes a 6 inch round Double-D Smart Coil built for high trash areas and small target sensitivity, waterproof to 10 or 16 feet depending on the host machine, at $225.00.
Best for: trashy parks and old house sites on an Equinox or X-Terra Pro
Check price on Amazon
Nokta LG15 Coil (6 inch)
$127.99Nokta publishes a 6 inch DD coil for The Legend, built for the same job of separating targets in dense iron and trash that a machine's stock 11 inch coil struggles with, at $127.99.
Best for: Legend owners hunting genuinely trashy ground
Check price on AmazonExpert: the narrowest and most surgical options
Both picks here go past what most trashy sites actually require. They earn a place when even a 6 inch coil still reports two overlapping tones, which happens on the most severely trashed old house sites and demolition ground.
Garrett 5 by 8 DD PROformance Coil
$164.95Garrett publishes a 5 by 8 inch DD PROformance coil built as the sniper option for the AT series, aimed at working between iron nails on genuinely old sites, at $164.95.
Best for: AT owners on the most severely trashed sites
Check price on Amazon
Coiltek 10 by 5 NOX Search Coil
$308.00Coiltek publishes a 10 by 5 inch elliptical for the Equinox series designed for tight spots and high trash, keeping a longer sweep footprint than a round 6 inch coil while staying narrow enough to work between iron, at $308.00.
Best for: trashy sites where you still want some sweep coverage
Check price on AmazonWho should not buy this tier: Do not buy either of these for an ordinary park or field. A 5 by 8 or 10 by 5 inch coil covers ground slowly, and on a site with only occasional iron the standard 6 inch coils above will find the same targets faster with less sweep repetition. Buy this tier only once a specific site has already proven too trashy for the standard small coil to separate cleanly.
How do the small coils compare by machine family?
Read the "fits machines" column before the size column. No coil here crosses between Minelab, Nokta and Garrett bodies, and in most cases not between different model lines from the same brand either.
All five small coils in this catalog are brand and often model-specific, and none of them fit a machine outside the family listed.
| Coil | Size | Type | Fits | Price |
|---|---|---|---|---|
| Minelab EQX 06 Coil | 6 inch | Double-D | Equinox series, X-Terra PRO | $225.00 |
| Nokta LG15 Coil | 6 inch | DD | Nokta The Legend | $127.99 |
| Nokta LG24 Coil | 9.5 by 6 inch | DD | Nokta The Legend | $135.99 |
| Garrett 5 by 8 DD PROformance Coil | 5 by 8 inch | DD | Garrett AT series | $164.95 |
| Mars Sniper 10 by 6 DD Coil | 10 by 6 inch | DD | Garrett AT series (aftermarket) | $112.50 |
| Coiltek 10 by 5 NOX Search Coil | 10 by 5 inch | Elliptical | Minelab Equinox series (aftermarket) | $308.00 |
Dimensions and fitment are quoted from the manufacturer listing for that product. Always confirm coil compatibility against your machine's own manual before buying, since a model refresh can change what fits.
What else changes on a trashy site besides coil size?
Iron audio and discrimination settings do the other half of the job a small coil starts. Turning iron down in volume rather than rejecting it outright, as Teknetics publishes on the Teknetics G2+, lets you hear a good target hiding next to iron instead of silencing both. The old coins roundup covers the machines built around that kind of audio control in full, and pairing one of them with the right small coil is what actually clears a genuinely difficult site rather than either change on its own.
Recovery speed also interacts with coil size in a way that is easy to miss. A small coil narrows the field, but a slow-recovering machine can still blur two close signals together even with a small coil fitted. The discrimination guide and the generated starting settings for the AT Pro on an old house site both cover how these settings interact in practice.
How do you actually swap a coil without damaging the connector?
Most coils connect through a small locking cable plug near the base of the lower shaft rather than a screw terminal, and the most common way people damage that connector is forcing it in at the wrong angle or yanking the cable to disconnect it rather than gripping the plug itself. Power the machine off before swapping, line the connector pins up carefully, and pull the plug body rather than the cable when removing it. None of this is difficult, but it is exactly the kind of small habit that determines whether a coil swap stays a two minute job for years or eventually costs you a bent pin and a repair.
Store the coil you are not using somewhere it will not get stepped on or dropped, and fit a coil cover on whichever one stays mounted, since the front edge of a searchcoil is the part most likely to meet a rock. A cover costs a fraction of the coil itself and is the cheapest insurance in this entire category.
How we chose
We did not test any of these coils in person and no separation or depth claim here is a result we obtained. Every dimension, coil type and fitment is quoted from the manufacturer listing for that product. Picks were organised by the machine family each coil fits, because coils are not interchangeable between brands and in most cases not between a brand's own model lines either.
Sources
- Minelab EQX 06 Coil product listing
- Nokta LG15 and LG24 Coil product listings
- Garrett 5 by 8 DD PROformance Coil product listing
- Mars Sniper 10 by 6 DD Coil and Coiltek 10 by 5 NOX Search Coil product listings
Frequently asked questions
Will a small coil fit any metal detector?
No. Every coil in this catalog is built for a specific machine family, and in several cases a specific model line within that family. The Minelab EQX 06 Coil (6 inch) fits the Equinox series and X-Terra Pro, the Nokta LG15 Coil (6 inch) fits only The Legend, and the AT series coils fit only Garrett's AT platform. Always check the manufacturer's fitment list before buying.
Does a small coil lose depth compared with the stock coil?
Often slightly on a large target, because a smaller coil samples less ground volume. On a coin-sized target in trashy ground the practical difference is usually small next to the gain in separation, which is the whole reason small coils exist for this use case rather than for maximising raw depth.
How small a coil do I actually need?
Start with a middle option like the Nokta LG24 Coil (9.5 by 6 inch) or Mars Sniper 10 by 6 DD Coil rather than jumping straight to the smallest available. Move down to a true 6 inch or 5 by 8 inch coil only once you find that a middle-sized coil still reports overlapping signals on your worst sites.
Can I use a small coil as my only coil?
You can, but you will cover ground much more slowly on open sites where separation is not the problem. Most experienced detectorists keep a standard or large coil for general use and switch to a small coil specifically for known trashy ground, rather than leaving a small coil on permanently.
Why does the Coiltek coil cost more than the Minelab-branded one of a similar size?
Aftermarket coils like the Coiltek 10 by 5 NOX Search Coil are often built with a different shape, in this case a longer elliptical rather than a round profile, aimed at balancing coverage against separation differently than the manufacturer's own small coil. The price reflects that different design and a smaller production run rather than simply being a premium version of the same coil.
Researched, not professional advice. This page is compiled from published specifications, manuals and owner-review consensus, not hands-on testing. Target ID numbers, depth figures and settings vary with soil chemistry, moisture, target size, depth, orientation and firmware version, so treat every figure here as a starting point and verify it against your own machine's manual and your own ground. As an Amazon Associate we earn from qualifying purchases.