  The Tunka Radio Extension (Tunka-Rex) is a digital antenna array located in
the Tunka Valley in Siberia, which measures the radio emission of cosmic-ray
air-showers with energies up to EeV. Tunka-Rex is externally triggered by the
Tunka-133 air-Cherenkov timing array (during nights) and by the Tunka-Grande
array of particle detectors (remaining time). These three arrays comprise the
cosmic-ray extension of the Tunka Advanced Instrument for cosmic rays and Gamma
Astronomy (TAIGA). The configuration and analysis pipeline of Tunka-Rex have
significantly changed over its runtime. Density of the antennas was tripled and
the pipeline has become more developed forming now sophisticated piece of
reconstruction software. During its lifecycle Tunka-Rex has demonstrated that a
cost-effective and full duty-cycle radio detector can reconstruct the energy
and shower maximum with a precision comparable to optical detectors. Moreover,
it was shown that cosmic-ray instruments, that use different detection
techniques and are placed in different locations, can be cross-calibrated via
their radio extensions. These results show the prospects of application of the
radio technique for future large-scale experiments for cosmic-ray and neutrino
detection. For the time being Tunka-Rex has ceased active measurements and
focuses on the data analysis and publication of corresponding software and data
in an open-access data center with online analysis features. In this report we
present the current status of the array and give an overview of the results
achieved during these years as well as discuss upcoming improvements in
instrumentation and data analysis, which can be applied for the future radio
arrays.
