I just finished moving my antenna into the hull of my HL Pz3 by wrapping 22-guage wire (approx9.5 inches)around a pencil, which I then cut to length. I then soldered it to the Rx board's existing antenna lead, covered with shrink wrap, and mounted the new load coil vertically in the hull next to the smoke unit using silicon adhesive. It's just over 1 inch long and fits with plenty of space to spare. I'll post a pic if you'd like.