garrett coil sizes

[dragon6banger]

i have a garrett gtp 1350 with stock coil and i have a 10X14 DD coil is that the biggest coil out there or is there a bigger one?? or is there a way to make like an 18in one?? thanks everyone HH does anyone know of a bigger coil

 

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[outdoors]

go to one of the GPAA gold & treasure shows when it comes close to your area, I have seen
coils range from 20" to close to 3' (feet) oval in shape might have one for a garrett detector