The tank coil is made
using a 1.25 inch pill bottle wrapping it typically with #20 - #22
AWG enameled wire. I didn't have any so I simply stripped a length of Ethernet
cable and used the insulated wire inside.
I made L1 for 40 meters by wrapping the
wire around the pill bottle 14 turns and then making a 1-inch loop
outward twisting it for the tap and then continuing to wrap until
turns. This is the primary side. I wrapped the wire tight
I then wrapped L2 by winding 4
turns over the 14 turns off L1 also side-by-side (non-overlapping).