The project is impressive, but it doesn't help me, the antenna is with amplifier, I'm looking for a way to make the original antenna of the AMB system. The track loop is not a problem, they are two cable lines joined by a resistance of 470ohm, this loop, is attached to the decoder with a coaxial cable, which has an impedance adapter made with a ferrite toroid... that is the cable I am looking for, I have tested with RF schemes of a 6:1 balum, but they have not worked for me.
thanks!!