I have two trashy fields to go over..One may have been hit, the other gave up a bunch of clad in just a few minutes of playing around..I am going to use the Vaquero, so I expect that Dave will have some ideas on the specifics for this machine..However, this type of searching has its own rules that may or may not work..I don't think you just set the sensitivity on High and go whipping across the ground like the Red Queen in Alice and Wonderland..Years ago, I was out with a Fisher right after two Discriminator machines worked over the field.The guys were sitting on a bank enjoying watching me dig dry holes..Number 100 was a huge gold college ring that might fit on a thumb that was hit once or twice with a board...What are techniques that you have used? Coil, height, speed, settings, Even for such a simple procedure, there can be a lot of variables .....cordially NAD