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The IceCube Neutrino Observatory at the geographic South Pole is, with itssurface and in-ice detectors, used for both neutrino and cosmic-ray physics.The surface array, named IceTop, consists of ice-Cherenkov tanks grouped in 81pairs spanning a 1 km$^2$ area. An enhancement of the surface array, composedof elevated scintillation panels and radio antennas, was designed over the lastyears in order to increase the scientific capabilities of IceTop. The surfaceradio antennas, in particular, will be able to reconstruct $X_\mathrm{max}$, anobservable widely used to determine the mass composition of cosmic rays. Acomplete prototype station of this enhanced array was deployed in the Australsummer of 2019/20 at the South Pole. This station comprises three antennas andeight scintillation panels, arranged in a three-arms star shape. The nominalfrequency band of the radio antennas is 70 to 350 MHz.  In this work, we use a state-of-the-art reconstruction method in whichobserved events are compared directly to CoREAS simulations to obtain anestimation of the air-shower variables, in particular, energy and$X_\mathrm{max}$. We will show the results in this unique frequency band usingthe three prototype antennas.

Estimation of $X_\mathrm{max}$ for air showers measured at IceCube with elevated radio antennas of a prototype surface station