  Interferometric measurements of the radio emission of extensive air showers
allow reconstructing cosmic-ray properties. A recent simulation study with an
idealised detector promised measurements of the depth of the shower maximum
$X_\mathrm{max}$ with an accuracy better than 10$\,$g$\,$cm$^{-2}$. In this
contribution, we evaluate the potential of interferometric $X_\mathrm{max}$
measurements of (simulated) inclined air showers with realistically
dimensioned, sparse antenna arrays. We account for imperfect time
synchronisation between individual antennas and study its inter-dependency with
the antenna density in detail. We find a strong correlation between the antenna
multiplicity (per event) and the maximum acceptable inaccuracy in the time
synchronisation of individual antennas. From this result, prerequisites for the
design of antenna arrays for the application of interferometric measurements
can be concluded. For data recorded with a time synchronisation accurate to
1$\,$ns within the commonly used frequency band of 30$\,$MHz to 80$\,$MHz, an
antenna multiplicity of $\gtrsim 50$ is needed to achieve an $X_\mathrm{max}$
reconstruction with an accuracy of 20$\,$g$\,$cm$^{-2}$. This multiplicity is
achieved measuring inclined air showers with zenith angles $\theta \geq
77.5^\circ$ with 1$\,$km spaced antenna arrays, while vertical air showers with
zenith angles $\theta \leq 40^\circ$ require an antenna spacing below 100$\,$m.
Furthermore, we find no improvement in $X_\mathrm{max}$ resolution applying the
interferometric reconstruction to measurements at higher frequencies, i.e., up
to several hundred MHz.
