I tried a field yesterday with a Safari /11 "coil.but there was that much junk it was sending the Safari crazy .so this morning i decided to give it a try with my F75 with the little coil fitted and i started to get lots of good signals straight away and within about ten minutes i got a 70/dime signal and pulled out an 1891 seated liberty dime. not bad to say im in England, ill try and post some photos later, any info on this coin would be much appreciated .