This contribution presents the characterization of a stripline embedded in a coaxial system. The stripline has been manufactured using HIPS as the main substrate. The metallic strip has been manufactured on 50mm thick kapton film which is binded to the main substrate. The transmission line plays a very important role in the overall performance of the ultrawideband radiating element currently under development. A multiline method has been used for the characterization of the stripline. The influence of the conductivity obtain in the fabrication of the conductive ink on the propagation characteristics of the transmission line is analyzed. Simulations and measurements assess the goodness and possible negative effects of the fabrication process to rely on it for future designs.