So what is the best overall frequency for limiting emi and getting good depth when metal detecting. I hear V3I folks including myself talk about EMI, and I hear the MXT or M6 or even DFX talk about great depth and no significant EMI issues. I hunted next to a DFX and I had EMI issues and even after making the standard and extended adjustments could just barely hunt. THe DFX was just working away no problems. Just looking for more detailed info and explanation.