The resistivity anisotropy is an important parameter for interpretation of electromagnetic soundings data. The importance of anisotropy was demonstrated by the marine electromagnetic community. Significant anisotropy is also observed in near surface media. In this abstracts we are discussing the detectability of anisotropy using land-based controlled source radiomagnetotellurics with a horizontal electric dipole. Our field experiment was performed in an area with 1D geology and two layers with strong a priori detected anisotropy. We are comparing controlled source high frequency responses in different geometries (inline and broadside), and the dependency of anisotropy detectability taking into account a length of the source using both numerical simulation and anisotropic inversion of field data.