no big roots not will cause false signals. that being said, your machine detects something metal. sometimes you can hear a big piece of metal very deep, but the detector says its only six or eight inches down. sometimes the machine will tell you a good target is there, but you have removed the ground that should occupy the target, only to find a rusty nail a few inches over. the key to eliminating these errors is to learn your machine and the pinpointing method of your machine. before you decide to dig the target it should be repeatable and solid. solid is hard to describe, but as you pinpoint the sound should be clear and definite. if it pinpoints all over the place it prolly a big target deep. if you hear a good signal, but it pinpoints several inches over, it prolly the old rusty nail. practice is the key. re-read the insrtuction book of your detector, this can be helpful, because when you read it the first time, you didnt have any experience. now that you have used it, now you understand better what the book is saying. be patient, go slow, think before you dig, have fun learning your machine. hope this helps david
