Any larger coil will give you greater depth but also has the drawback of a bit harder pinpointing. Using the word significant when asking leads me to believe you are looking for a doubling of the depth from the standard coil. A formula known as the inverse square will help you in this but it's not straight forward enough to explain the mathematics of it all. Generally speaking, the power of the field diminishes by the inverse of the square of the distance from the source. The same rule applies when increasing the signal. The signal diminishes based on the size of the coil and the greater power. Simplified, doubling the coil size means about 25% more depth. Tripling it means about 40% more depth. Increasing the power is the key to the depth issue but the time it takes for a field to build up will throw a huge delay into the mix making it something you don't want to do.
Yes, you get more depth. Significant? If it allows you that extra half inch to find a ring, that is quite significant. If it allows you three inches extra to find that large cent, yes. If you can find a tin can at 2 feet, that's quite significant but rather useless.
Your depth will increase significantly if you slow down your sweep pattern and overlap your sweeps. My granddaughter once described it perfectly. When I told her to slow down her sweep and listen very carefully, she said "You're right, Grandpa. When I squint my ears, I can hear tiny things."
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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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