Was hunting this afternoon,was getting nice quarter signals 2.5 was dominant pinpointed like a coin turns out they were hand pounded rusty nails,about 8 inches down dug about 5 of them and they all sounded good,any tips to avoid this? Or can someone explain halo,fro what I get its when the target starts to breakdown and the soil is soaking up the minerals from said target,which makes it read higher