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Seen from the walk-recovery-find-ratio those sweeping coils are timewasting and sometimes very muscle- plus ellbow-stressing.
Something like a floor-shifter (comparable with a large car windshield wiper) could be a good alternative:
ca. 1m long with 2 stretched DD coils: a small one in the middle for pinpointing and the little stuff and a large one on the outside.
If it doesn't work, only one DD coil must be used, perhaps with more windings near the center.
In this case, each single coil of the DD coil would be ca. 50cm to 2 ft. (65cm) long and perhaps 10cm (4 inch) broad.
The coil also could be shaped that on the outside it is just 5cm broad but in the middle 20cm - or vice versa (if its built stable enough)!
With such a lenght this coil would be fantastic for very deep objects but for small ones, too, if someone directly walks over them
and the coils center is very sensitive made for small stuff like coins 40cm deep.
Even 2m models would be possible - bodymountable units - so both arms are free.
And the lightweight 1meter version could have 2 seperate holders for the arms.
The coil also could have the shape of a bomerang or a flat snowplow.
Main usage of course would be: huge fields and for larger stuff, where one single person can walk lines or grid patterns.
Some little plastic wheels could be added to drag the coil over flat fields or even areas.
The weight of course must not be too high, below 1,5kg (3 pounds) for the 1m. This is possible if theres only a stable plastic skin
around the windings and not much more. The 45cm Detech-Coil is a very good example for a large but still very lightweight coil.
Shure, for woods or regions with many rocks on the ground this coil would be not the best choice,
but it would be perfect for very large and flat terrains including very deep objects.
With such a coil someone could walk just relaxed straight ahead without ongoing and pace reducing sweeping-work
and can "walk directly" over interesting finds. Plus: with 2 holders the weight of the coil would be even reduced to the half,
seen from how heavy it is to hold for someone.
btw. A similar coil already exists - it is the huge and broad 80cm coil from Nexus. It is double oo .
But I think it must not be so broad, it also works with two flat-squeezed O's (10-20cm).
Good luck and I will develope it sometimes anyway, because I like this kind of design.
Its extremly effective at huge areas and very comfortable to use. No stupid and arm-wrecking sweep sweeep sweeeeeeeep all the time!
I told you this here because for me it may take some time to create such coils so you already can experiment a bit if you like.
The most simple experiment:
Use a working coil where the wires are open available and squeeze them.
If you have an old plastic case of a PC keyboard you can use it as housing.
Even a "spread to left and right - oo" ferrite-coil design would be possible. Of course without ferrite core because of the weight.
What weights a 1cm thick and 1m long ferrite-rod inclusive wires and plastic housing? For shure: too much.
But I don't wanna confuse you. "DD ferrite coil"-Design for Induction Balance could be too complicated to adjust, anyway.
And the EM-field also would be not very directional -> "into the ground looking".
Last but not least: Also just 50cm broad coils could be possible with this design, don't stop think about or like it because the 1 meter value!
The method is what counts and is pretty new: easy peasy (deep!) treasure hunting without exhausting (large) sweeping coils!
And with those little 25cm coils this 10.000 times sweeping to get some amount of sqaremeters together also is not always pleasureful.
Something like a floor-shifter (comparable with a large car windshield wiper) could be a good alternative:
ca. 1m long with 2 stretched DD coils: a small one in the middle for pinpointing and the little stuff and a large one on the outside.
If it doesn't work, only one DD coil must be used, perhaps with more windings near the center.
In this case, each single coil of the DD coil would be ca. 50cm to 2 ft. (65cm) long and perhaps 10cm (4 inch) broad.
The coil also could be shaped that on the outside it is just 5cm broad but in the middle 20cm - or vice versa (if its built stable enough)!
With such a lenght this coil would be fantastic for very deep objects but for small ones, too, if someone directly walks over them
and the coils center is very sensitive made for small stuff like coins 40cm deep.
Even 2m models would be possible - bodymountable units - so both arms are free.
And the lightweight 1meter version could have 2 seperate holders for the arms.
The coil also could have the shape of a bomerang or a flat snowplow.
Main usage of course would be: huge fields and for larger stuff, where one single person can walk lines or grid patterns.
Some little plastic wheels could be added to drag the coil over flat fields or even areas.
The weight of course must not be too high, below 1,5kg (3 pounds) for the 1m. This is possible if theres only a stable plastic skin
around the windings and not much more. The 45cm Detech-Coil is a very good example for a large but still very lightweight coil.
Shure, for woods or regions with many rocks on the ground this coil would be not the best choice,
but it would be perfect for very large and flat terrains including very deep objects.
With such a coil someone could walk just relaxed straight ahead without ongoing and pace reducing sweeping-work
and can "walk directly" over interesting finds. Plus: with 2 holders the weight of the coil would be even reduced to the half,
seen from how heavy it is to hold for someone.
btw. A similar coil already exists - it is the huge and broad 80cm coil from Nexus. It is double oo .
But I think it must not be so broad, it also works with two flat-squeezed O's (10-20cm).
Good luck and I will develope it sometimes anyway, because I like this kind of design.
Its extremly effective at huge areas and very comfortable to use. No stupid and arm-wrecking sweep sweeep sweeeeeeeep all the time!
I told you this here because for me it may take some time to create such coils so you already can experiment a bit if you like.
The most simple experiment:
Use a working coil where the wires are open available and squeeze them.
If you have an old plastic case of a PC keyboard you can use it as housing.
Even a "spread to left and right - oo" ferrite-coil design would be possible. Of course without ferrite core because of the weight.
What weights a 1cm thick and 1m long ferrite-rod inclusive wires and plastic housing? For shure: too much.
But I don't wanna confuse you. "DD ferrite coil"-Design for Induction Balance could be too complicated to adjust, anyway.
And the EM-field also would be not very directional -> "into the ground looking".
Last but not least: Also just 50cm broad coils could be possible with this design, don't stop think about or like it because the 1 meter value!
The method is what counts and is pretty new: easy peasy (deep!) treasure hunting without exhausting (large) sweeping coils!
And with those little 25cm coils this 10.000 times sweeping to get some amount of sqaremeters together also is not always pleasureful.