Without going into detail here, I'm attempting to replace a missing AM antenna (back of set mounted, swivelable type) with one from another set, albeit the same make. The receiver in need of the antenna has the original wires still hanging out the back of it where the antenna was cut/removed. The replacement antenna has the same colour wires, but confusingly, plus a white wire too. I just looked at an old spare receiver chassis that I have (not the same brand) and it too uses similar colour wires. It got me wondering if there is a colour convention associated with the wiring for these rear mounted AM antennas?