If you’re referring to my craptastic range extender, kind of. I mean it’s not just copper wire coiled any which way. It’s vaguely tuned to 15.56 MHz - well enough to work anyway.
Out of memory, it’s two 50-mm diameter, 5-turn, 24-gauge enameled copper wire coils connected together with a couple feet of 14 ga el-cheapo household electrical cord. Lengthen or shorten the electrical cord for best performances 
But i’ll measure it exactly when I’m back home. Right now I’m out fishing.