Filler level measuring device

The invention relates to a measuring device neck (12) of a radar-based filling level measuring device (1) for determining a filling level profile (L (a, #)) of a filling substance (2). In this case, the measuring device neck (12) is distinguished in that the waveguides (121, 121 ', 122, 122') for contacting the antenna arrangement (10) are arranged internally in a row along a contour (k1, k2) which surrounds the device neck axis (a) in a radially symmetrical manner and adjoin the device neck (12). This is first advantageous with respect to the production of the measuring device neck (12) because the waveguides (121, 121 ', 122, 122') can together be made into a monolithic base body (123) so as to be easily installed in the measuring device neck (12). The inventive arrangement according to the waveguides (121, 121 ', 122, 122') in the measuring device neck (12) also facilitates the thermal management of the transmitting/receiving electronics (11) of the filling level measuring device (1) as its thermal critica