Here, the angles formula_4 and formula_5 indicate a dependence on direction from the antenna, and formula_6 stands for the power the transmitter would deliver into a matched load. The gain formula_1 may be broken down into three factors; the antenna gain (the directional redistribution of the power), the radiation efficiency (accounting for ohmic losses in the antenna), and lastly the loss due to mismatch between the antenna and transmitter. Strictly, to include the mismatch, it should be called the realized gain, but this is not common usage.