So I'm a newb.. been reading lots of articles and books and practicing in the backyard. The house was built in the 60's, so I figure there's enough junk and pennies to practice on. One of the tips I have read is to look for unusual plants and look around them. We have two old lilac buses about eight feet apart in the backyard along the fence, so I figure I'll go give it a try around them. I have the detector set to discriminate out iron, but that's it. So I wave the detector and it goes BONKERS! Signals all over the board all saying surface. So I scrape a little dirt and nothing, wave the detector again, and BONKERS! I'm thinking interference from something (kinda near power lines), but the detector seems normal a few feet down the fence, so I dig down over the Bonkers spot, and six inches down I find a metal grill (fiance says it is expanded metal). After a half hour of digging, we have a 4' x 4' piece of expanded metal! I keep getting weird signals in the hole, what I would expect to be a nail 4-5 inches down, I dig and nada. Then the same signal a foot away, and nada! Would leftover rust in the hole give me false signals?
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