Got out there today, the site is 40+miles away. Close to the house was terrible as it had debris strewn all over the ground. It seems like the place was set on the location where the farmer had his out buildings (the house next door was an 1860 homestead). I was digging square nails and farming implements. I couldn't use the GT near the house, the EMI was so bad that the detector wouldn't even quiet down in auto. I gave up and got out the Tesoro for a little while, it worked much better around the EMI. I dug a lot of fist sized objects but they were from the buried trash and pieces of siding. There was only one location hidden from the view of other houses. I dug a lot of holes but never found anything of value except 2 pennies. Then I got a call from the roofer that was working on my house and had to leave. I may go back but I won't be using the GT as it was almost worthless. I had to shut it off every time I dug an object because when the coil wasn't parallel with the ground it was going psycho. Too bad because its my favorite detector. I have a Whites TDI pulse machine with high/low conductivity. If there's large iron, zinc lids, copper and silver will come in as high conductor so I can eliminate a lot of trash and small iron. But its heavy and I don't care to swing it much anymore....yeah, I may have to hip mount it. It does very well around EMI. The aluminum siding on the house goes right to the ground so I can't get within 2ft of the house and get a reliable reading.
I may change coils to the 8" tornado and see how it does. Maybe its the SEF coil that's so sensitive to the EMI?
Funny thing, I couldn't see any reason for all the noise. The house is vacant, I wasn't near the power lines and usually I can tell if its a buried cable TV wire. When I got about 60ft from the house I was able to crank the sens up pretty high. That area was lower grade than the house and had a high water table ie, the holes started filling up with water at 8-10 inches. Maybe its the old mans poltergeist screwing with me...hehe
I'll keep you posted.There are a couple nice well worn soccer fields nearby..I may hit them for an hour or 2 when I get back out that way.