The Best Coil Type for your Metal Detector

Metal detectors come with a variety of coil sizes and types. Some detectors are designed to work with one specific coil, while others have multiple coils available that you can interchange. The main types of coils are Concentric, Elliptical, and Double D coils. Each work a little differently and have different advantages and disadvantages.


Concentric Coil

Concentric coils are round shaped. They transmit a cone shaped signal into the ground that reaches deepest in the center of the coil. When using this type of coil you should overlap your swings in order to maximize the depth that you find items. If you don’t, you will likely miss many targets.


  • Pinpointing is easiest because the strongest signal is always at the center of the coil.
  • Discrimination works best with concentric coils.


  • Are less stable when they are affected by ground mineralization and salt water.

Concentric Metal Detector Coil

Elliptical Coil

These are similar to concentric coils except that instead of being round they are oval shaped. By making the coil longer front to back and shorter side to side, you have a coil with the same area as a concentric coil but that will cover more ground with each sweep of the coil. Like the concentric coil, the signal reaches the deepest in the center of the coil so you should overlap you swings to achieve maximum depth.


  • Covers more ground with each sweep than a concentric coil of the same size.


  • Pinpointing is somewhat more difficult to learn than with a concentric coil, but still easier than with a Double D coil.
  • Are less stable when they are affected by ground mineralization and salt water.

Elliptical Metal Detector Coil

Double D Coil

The Double D coil had two “D” shaped halves to the coil. This results in a more flat and square shaped signal being sent into the ground.


  • It doesn’t require the overlapping swings needed by concentric and elliptical coils because the signal is more square than cone shaped.
  • It is less affected by ground mineralization since the field is flat.
  • Since the signal is more flat, it is better at separating between two objects that are close together in the ground.


  • Pinpointing is most difficult with this type of coil.
  • Discrimination does work quite as well as with the other coils.Double D Metal Detector Coil

The Best Metal Detector Brand

Choosing the best metal detector brand is like choosing the best automobile brand. There are many brands to choose from, and each brand has many models to choose from. Just as some people prefer Chevy or Ford, some detectorists prefer Garret, or Fisher, or another metal detector brand.

There is no single best metal detector brand, but there are some that have earned the status as being great brands. There are too many metal detector brands to cover all the brands you can choose from, but I will cover some of the most popular brands available. These are, in alphabetical order, Bounty Hunter, Fisher, Garrett, Minelab, Tesoro, and White’s.


Bounty Hunter

Bounty Hunter makes metal detectors ranging from $100 to $350. They specialize in inexpensive detectors. They won’t have all the features and capabilities of higher end detectors but are more affordable for a detectorist on a tight budget.



Fisher makes metal detectors ranging from $200 to $1150. Dr. Gerhard Fisher obtained the first patent ever issued for aircraft radio direction finders in the late 1920’s. He noticed that metal objects would cause errors, which lead to the creation of Fisher in 1931. They are known for making high quality detectors at all price levels.



Garrett makes metal detectors ranging from $150 to $1200. They make a variety of detectors and are known for having excellent quality, especially on entry to mid-level detectors. They are also well known for making security metal detectors like the ones you walk through at airports.



Minelab makes metal detectors ranging from $400 to $5900. They are the luxury brand of metal detectors. They focus on high quality detectors and so they tend to be more expensive. They make excellent quality mid-level to high end metal detectors.



Tesoro makes metal detectors ranging from $150 to $750. The founder had previously worked at both Fisher and Bounty Hunter and opened Tesoro in 1980. He named it Tesoro after the Spanish word for treasure. They are known for making quality entry level and mid-level metal detectors.



White’s makes metal detectors that have recommended retail prices of $600 to $1800. Like the other brands, you can buy the detectors for less than the MSRP, but unlike the other brands, they restrict dealers from advertising prices below this amount so you need to call or go to a local shop to get prices. White’s has been around since the 1950’s and are a popular brand for mid-level to high end detectors.