A towed farm implement includes a set of auxiliary wheels mounted for elevating the implement to a height which permits the implement to be pulled over and lowered onto a transport trailer or which permits the trailer to be otherwise maneuvered to a loading position beneath the implement. In one embodiment, the mounting portion is mounted directly to leaf springs of a suspension system. An amplifier amplifies the phase adjusted signal and amplitude modulates the phase adjusted signal, based on the amplitude adjusted signal, to produce a polar coordinate transmit signal. An install executing unit acquires the software from the software source selected by the software-source selecting unit. The ligands may be used to form metal complexes that are useful in diagnostic and therapeutic applications.