All you cz users if you detect under power lines now you don't have to lower your sense to stop noise, just go to your local radio shack and purchase a snap on EMI ferrite date-line filter, get the larger rectangle choke core (larger inter hole) .I put on on my CZ-70 coil wire up next the spring at the plug now I can detect under power lines with no noise or lost sense,To view this EMI choke core go to the Fisher F forum under EMI , HH 