Real-valued (RV) Volterra series has been the base of power amplifiers (PAs) behavioral modeling. However, most of behavioral models for radio frequency (RF) PA in the literature are in baseband (BB). In this letter, we make a study on RV models departing from complex-valued memory polynomial (MP) and generalized MP (GMP) for the PA behavioral modeling in RF domain. The proposed RV models are experimentally validated with data measured from a wideband PA