frequency - Building a telephone spy

I am implementing the following circuit

but I am stuck at one point.

How can we input the wires in IN1 , IN2, OUT1, OUT2? I don't know which wire to insert because there are almost 4 or 5 wires inside the telephone wire. So which wire should I insert in the respective areas?

And is there any alternative for the antenna because it is short in market. :)