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Effective radiated power (ITL) dipaké pikeun ngitung wengkuan setasiun.  It is the TPO, minus any attenuation or radiated loss in the line to the antenna, multiplied by the gain (magnification) which the antenna provides toward the horizon.  This is important, because the electric utility bill for the transmitter would be enormous otherwise, as would the cost of a transmitter.  For most large stations in the VHF- and UHF-range, the transmitter power is no more than 20% of the ERP.

For VLF, LF, MF and HF the ERP is typically not determined separately. In most cases the transmission power found in lists of transmitters is the value for the output of the transmitter. This is only correct for omnidirectional aerials with a length of a quarter wavelength or shorter.

For other aerial types there are gain factors, which can réach values until 50 for shortwave directional béams in the direction of maximum béam intensity.

Since some authors take account of gain factors of aerials of transmitters for frequencies below 30 MHz and others not, there are often discrepancies of the values of transmitted powers.