The result of the presence of standing waves on a transmission line is:

Standing waves on a transmission line are the direct result of an impedance mismatch between the feedline and the load (the antenna). Because some of the transmitter's RF energy is reflected back instead of being absorbed by the antenna, the overall transfer of energy to the radiating element is reduced. If the system had a perfect impedance match, there would be no reflected energy, meaning no standing waves would be present (an SWR of 1:1) and energy transfer would be maximized. Distractors claiming that standing waves cause maximum transfer or perfect matching represent the exact opposite of what actually happens.