If both source and load impedances are purely resistive, what value of load impedance will result in maximum power delivery to the load?

According to the Maximum Power Transfer Theorem in electronics, power transferred from a source to a load is maximized when the resistance of the load exactly equals the resistance of the source. In amateur radio, equipment is standardized to an impedance of 50 ohms. For a transmitter (the source) to deliver maximum power to an antenna (the load), the antenna system should ideally present a 50-ohm impedance. If the load impedance is higher or lower than the source impedance, some of the power is reflected back toward the source. This results in an elevated Standing Wave Ratio (SWR) and less radio frequency power actually being radiated by the antenna.