Attach the clip or clamp to the pipe or cable (target line) in the Direct Mode and activate it. This transmits the strongest signal directly to the target line, allowing you to trace it at a greater depth and for a longer distance. If the target line is not accessible, place the transmitter over the target line and activate it. Then use the receiver in the same manner to trace the signal emitted from the target line, regardless of the transmitter mode used. Note: You can use the receiver alone, in the Live Cable mode, when tracing an energized 50/60Hz power line.... no transmitter needed in this case.