Hunting around ANY old home or barn is a struggle, especially old farms. They would typically have a trash pit (a big hole dug two-three feet where they would throw trash and garbage, then burn it when I got full, followed by burying the remains and digging another pit. Over time, a lot of that stuff gets dispersed around the rest of the yard.
When you go back, concentrate on where people likely entered and exited the house and buildings. Area's between and in parking area's (cars or horse & buggy), and into the buildings. Look for the largest trees (or evidence of where they were) and search all around them. Before air conditioning, this is where people would hang out to catch a breeze and stay in the shade for comfort.
My buddy and I hunted an 1850's farmhouse this summer, and never got out of the front yard from between the front porch and the road, which was only a 50' x 50' area. Dug every signal in a 5 hour period. Had a pile of trash, but had these as well:
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Both of these had trash with them, or near enough to them, where signals were interfering. Sometimes, you got to get the trash removed to find the treasure!