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I would like to buy a 10-11" concentric coil for the explorer...

At least, Let me Detect behind you ! (My Opinion) <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/wink.gif" border=0 width=15 height=15 alt=";)">
 
I agree each coil design has their pluses and minuses.
-Bill
 
If the EX had a 10-11 inch concentric coil, would it's target ID capability extend deeper, down to the (presumed) depth that coil could reach?
 
Since testing a concentric coil on my Explorer last year I have begun thinking in 3D. Around sites I hunt there is a layer of rusty nails down in the 6-10 inch range that far outnumber the good targets and generally polute the ground around them with iron signals for some distance.
Lets say a coin is down there at 8 inches mixed with the iron at the same level and compare a 10 inch DD coil to a 10 inch concentric coil. At 8 inches the DD is gobbling a 2x10 inch bite of that iron infested ground yet the concentric at that depth with its cone shaped detection field is biting off only say a 3 inch circle. The concentric sees less of the iron infested ground than the DD, perhaps only 30% of the total signal is iron infested whereas perhaps 60% of the DD signal is iron. Which would ID the target more correctly? Probably the concentric.
I have not tested this line of thinking specifically but others who have used both the DD's and concentrics on various machines over the years feel the concentrics ID more accurately than a DD for a given machine.
Now comparing an Explorer with a DD to another brand of detector that uses a concentric is not comparing apples to apples, the Explorer puts a whooping on other machines that use concentric coils on a frequent basis. A head to head Explorer DD verses Explorer Concentric would be an interesting contest.
All the above only holds true for the described site condition, move the layer of nails to say 3 inches and the DD has the advantage. Try to detect some really nasty mineralized ground again the DD gains an advantage. A concentric is just another tool in the bag to try when a site seems to have been hunted out with the stock coil.
 
I too have found the concentric to go deeper then the DD as long as the area isn't infested with iron.
 
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