A few days ago I wandered out in the yard with a hand full of coins and the E Trac. I had the question in my mind about missing coins and why it would happen. I've been digging quite a few coins that were on edge or just off being on edge in the plugs I would cut out. I threw five coins on the ground flat and ran the coil over them and they all gave the correct reading for what they were. I stood them on edge and pushed each one of them in the ground all the way with my shoe in the vertical on edge position. I ran the coil over each one of them in a horizontal scan and only hit one of them, the penny. The silver quarter, clad quarter, nickle, and dime, no response at all, or maybe just a click or slight chirp. Strange to me but then I got to thinking (dangerous I know) I scanned all from a vertical stroke, in line with the detection field of the DD and it picked all of them up and had excellent ID's. Got me to thinking again :-\I don't know but it seems like the size of the object, coin sizes, diameter, is what the #'s and good warbles most likely come from, am I right? Now if I tilted the coil just slightly towards each of the coins as if a coin was just off being on edge I would pick up the diameter and would get a signal on the scan. I wonder just how many coins might fit this criteria that are missed. I've mentioned before, not here that my finds go up when I hunt in circles so to speak which is the way I hunt mostly. That just might be giving me a different angle of approach as I overlap as I slowly move forward circling. That could most definately be the reason why quite a few coins only give a signal from one direction..........What do we think here? Give the test a try. Still exploring this new world I guess.