A radar-based fill level meter for determining a fill level profile (L(α, β)) of a filling material, comprising the following components: - An antenna assembly, with ∘ a defined number of transmitting antennas, each of which can be used to transmit a radar signal (S HF) in the direction of the filling material, and ∘ a defined number of receiving antennas, each of which can be used to receive a receive signal (R HF) once the radar signal (S HF) has been reflected on the surface of the filling material, - a transmitter/receiver unit, which is configured ∘ to generate each radar signal (S HF), and ∘ to create the fill level profile (L(α, β)) based on the receive signals, and - a measuring device neck, which is arranged along a central device neck axis (a) between the antenna assembly and the transmitter/receiver unit, with ∘ a number of transmitting waveguides (121, 121') which corresponds to the number of transmitting antennas, which extend inside the measuring device neck parallel to the device neck axis (a) and connect each transmitting antenna to the transmitter/receiver unit, and ∘ a number of receiving waveguides (122, 122') which corresponds to the number of receiving antennas, which extend inside the measuring device neck parallel to the device neck axis (a) and connect each transmitting antenna to the transmitter/receiver unit, characterized in that ∘ the transmitting waveguides (121, 121') are arranged along a first contour (k 1), which radially symmetrically surrounds the device neck axis (a), and ∘ the receiving waveguides (122, 122') are arranged either along the first contour (k 1) or along a second contour (k 2, which also radially symmetrically surrounds the device neck axis (a). - An antenna assembly, with ∘ a defined number of transmitting antennas, each of which can be used to transmit a radar signal (S HF) in the direction of the filling material, and ∘ a defined number of receiving antennas, each of which can be used to receive a receive signal (R HF) once the radar signal (S HF) has been reflected on the surface of the filling material, ∘ a defined number of transmitting antennas, each of which can be used to transmit a radar signal (S HF) in the direction of the filling material, and ∘ a defined number of receiving antennas, each of which can be used to receive a receive signal (R HF) once the radar signal (S HF) has been reflected on the surface of the filling material, - a transmitter/receiver unit, which is configured ∘ to generate each radar signal (S HF), and ∘ to create the fill level profile (L(α, β)) based on the receive signals, and ∘ to generate each radar signal (S HF), and ∘ to create the fill level profile (L(α, β)) based on the receive signals, and - a measuring device neck, which is arranged along a central device neck axis (a) between the antenna assembly and the transmitter/receiver unit, with ∘ a number of transmitting waveguides (121, 121') which corresponds to the number of transmitting antennas, which extend inside the measuring device neck parallel to the device neck axis (a) and connect each transmitting antenna to the transmitter/receiver unit, and ∘ a number of receiving waveguides (122, 122') which corresponds to the number of receiving antennas, which extend inside the measuring device neck parallel to the device neck axis (a) and connect each transmitting antenna to the transmitter/receiver unit, characterized in that ∘ the transmitting waveguides (121, 121') are arranged along a first contour (k 1), which radially symmetrically surrounds the device neck axis (a), and ∘ the receiving waveguides (122, 122') are arranged either along the first contour (k 1) or along a second contour (k 2, which also radially symmetrically surrounds the device neck axis (a). ∘ a number of transmitting waveguides (121, 121') which corresponds to the number of transmitting antennas, which extend inside the measuring device neck parallel to the device neck axis (a) and connect each transmitting antenna to the transmitter/receiver unit, and ∘ a number of receiving waveguides (122, 122') which corresponds to the number of receiving antennas, which extend inside the measuring device neck parallel to the device neck axis (a) and connect each transmitting antenna to the transmitter/receiver unit, characterized in that ∘ the transmitting waveguides (121, 121') are arranged along a first contour (k 1), which radially symmetrically surrounds the device neck axis (a), and ∘ the receiving waveguides (122, 122') are arranged either along the first contour (k 1) or along a second contour (k 2, which also radially symmetrically surrounds the device neck axis (a).