Antenna impedance prediction via power amplifier parameter. In some embodiments, a power amplification system can include a splitter circuit and a combiner circuit, and first and second Doherty power amplifiers implemented in a quadrature configuration between the splitter circuit and the combiner circuit, with each Doherty power amplifier including a carrier amplifier and a peaking amplifier. The power amplification system can further include a monitoring circuit configured to measure at least some of base currents associated with the carrier and peaking amplifiers of the first and second Doherty power amplifiers, and generate a signal capable of adjusting a load impedance presented to an output of the combiner circuit.