A test prod for high-frequency measurement having a contact-side end for electrically contacting planar structures and a cable-side end, for connecting to a cable, wherein between the contact-side end and the cable-side end a coplanar conductor structure having at least two conductors is arranged, wherein on the coplanar conductor structure a dielectric is arranged over a predetermined section between the cable-side end and the contact-side end, wherein the test prod is between the dielectric and the contact-side end such that the conductors of the coplanar conductor structure are arranged freely in space and relative to the dielectric in a suspending manner, wherein on one side of the test prod facing towards the planar structure a shielding element is arranged extending into the area of the coplanar conductor structure.