So at this point, I would consider my little park ballfield to be hunted out with the 11" coil. I ended up finding 10 silvers, 2 indians, and roughly 50 wheat pennies out. The park dates back to 1880s and the soil is sandy so the coins sink deep. The oldest coin I have found so far with the CTX 11" at this park has been around 8", a 1907 O barber quarter. The rest of the coins were roughly 6" inches (nothing more shallow than 6") and for whatever reason could not be picked up by my old Safari. I am sure that there are older coins left in this park but there is also a lot of iron, which I am sure is a large reason why the Safari couldnt pick up these coins. So, would the 17" be worth it? How much depth am I going to gain? And how much Iron separation am I losing because of the added size? Thanks in advance!!