electromagnetic properties of a plasmonic nanosphere at optical frequencies is analysed. Two structures, based on well known small spherical antennas (Stuart and Best’ spherical resonators), are considered as the possible candidates for the RF replicas. The electromagnetic properties of these RF replicas are investigated analytically, numerically, and experimentally in 100-500 MHz RF frequency range. The basic property of a plasmonic sphere is the inversion of the electric field vector direction inside the sphere compared to the electric field vector direction outside the sphere. This phenomenon, is confirmed by FDTD simulations and the measurements on experimental RF replicas. It was found that the electric field inside Best resonator is more uniform than the electric field inside Stuart resonator. Thus, it appears that Best resonator is more suitable for the construction af an RF replica of plasmonic nanosphere. In order to test the possible application of developed RF replicas in scaled experiments, the prototype of RF plasmonic wavegude consisted of four Best resonators was constructed. The waveguide was excited in both transversal and longitudinal modes with the help of a short dipole. The phase of the incident electric field was scanned along the waveguide and the results revealed the existence of the backward and forward waves, which is consistent with the theorethical analysis. Therefore, it was shown that developed RF replicas of plasmonic nanospheres can indeed be used for the investigation of the basic electromagnetic properties of future plasmonic structures and metamaterials. This approach elegantly avoids the use of advanced and very expensive nanotechnology.