the f75 operates on a frequency of 13Khz.
Nel coils are one of the most highly rated after market coils available
the reason I got one is for better coverage over large areas, definately more depth than the stock coil - although there is certainly nothing wrong with the depth performance of the stock coil
of course there are always downsides to a much bigger coil - it weighs a lot more and you have to dig dig dig deeeeper holes.
I know there are still a bunch of silver coins hiding, deep, out there on my favourite beach
now if only the beach would lose the better part of a meter of sand, that would really be a happy happy krismis
