Pepper, the diagram that you show seems to make the antenna look a lot shorter and the coils spaced much closer together than what the instructions call for. Did you just make a smaller version of it for an example only? If that is the size that it is supposed to be then maybe I messed up from the conversion from centimeters to inches. I looked on a ruler and it said roughly 2.5 centimeters per inch which gets me about 6 inches between each coil, around 6 inches above it and below each coil. Is this correct? The antenna seems a bit taller than the UHF antenna that comes with the receivers if that is the correct measurement.