The aim of this work is to study the application of Ground-Based Radar (GBR) interferometry technique to study the vibration characteristics of wind towers by remote acquisitions without the installation of any sensor or corner reflector on the monitored tower. In particular, the objective of this work is to demonstrate that it is possible to use the vibration frequency and amplitude measured by the GBR along the whole tower to discriminate the vibration behaviour of the tower in the cases of wind turbine at rest and in function. In addition, it will be shown that it is also possible to point out the differences in the vibration behaviour of two nearby wind towers, either in their oscillation frequency or amplitude. The methodology that is applied relies on the radar interferometry technique. A stack of Real Aperture Radar (RAR) profiles are collected providing the radar scattered signal for each target along the range directions. The amplitude of radar signal in each profile allows to identify the location of the wind tower. For each range pixel associated to the wind tower, the stack of range profiles is further processed to estimate the interferometric phase changes along the time and finally the temporal profile of displacements. The spectrum of each temporal profile is computed to identify the vibration frequencies. The results of an experiment carried out at a wind farm to study the differences in the vibration behaviour of two nearby wind towers are presented.