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In many cases, for practical reasons, it is necessary to make the antenna shorter than the resonant length, this is called an electrically short antenna. An antenna shorter than a quarter wavelength presents capacitive reactance to the transmission line[citation needed]. Some of the applied power is reflected back into the transmission line and travels back toward the transmitter[citation needed]. The two currents at the same frequency running in opposite directions causes standing waves on the transmission line[citation needed], measured as a standing wave ratio (SWR) greater than one. The elevated currents waste energy by heating the wire, and can even overheat the transmitter.