  TAROGE-M is a self-triggered radio antenna array atop the 2700 m high Mt.
Melbourne in Antarctica, designed to detect impulsive geomagnetic emission from
extensive air showers induced by ultra-high energy (UHE) particles beyond 0.1
EeV, including cosmic rays (CRs), Earth-skimming tau neutrinos, and
particularly, the "ANITA anomalous events" (AAEs) from near and below the
horizon, which origin remains uncertain and requires more experimental inputs
for clarification.
  The detection concept of TAROGE-M takes advantage of a high altitude with
synoptic view toward the horizon as an efficient signal collector, and the
radio quietness as well as strong and near vertical geomagnetic field in
Antarctica. This approach has a low energy threshold, high duty cycle, and is
easy to extend for quickly enlarging statistics. Here we report experimental
results from the first TAROGE-M station deployed in 2020, corresponding to
$25.3$-days of livetime. The station consists of six receiving antennas
operating at 180-450 MHz, and can reconstruct source directions with
$\sim0.3^\circ$ angular resolution. To demonstrate its ability to detect UHE
air showers, a search for CR signals in the data was conducted, resulting in
seven identified events. These events have a mean reconstructed energy of
$0.95_{-0.31}^{+0.46}$ EeV and zenith angles between $25^\circ-82^\circ$, with
both distributions agreeing with simulations. The estimated CR flux is also
consistent with results of other experiments. The TAROGE-M sensitivity to AAEs
is approximated by the tau neutrino exposure with simulations, suggesting
comparable sensitivity as ANITA's at $~1$ EeV energy with a few station-years
of operation. These first results verified the station design and performance
in a polar and high-altitude environment, and are promising for further
discovery of tau neutrinos and AAEs after an extension in the near future.
