So Bosso Mucho Grande won't let the Tracker be modified-why not a concentric coil in an elliptical shape like the Garrett Ace so the signal can have a little compression and have enough "oomph" to be detected:ergo- the 8" sucks on small gold and nickels. That way, the buyer can get the fabulouls "muffler on a stick", el Bosso Mucho Grande stays happy, customers happy with the present Tracker can stay happy, and us weirdos can order the coil. Or, I guess, get the 4" coil and swing it all day covering a football field.