The low frequency instrument on the PUEO experiment targeting upgoing air showers

The Payload for Ultrahigh Energy Observations (PUEO) long-duration balloon experiment is designed to observe ultra-high energy (UHE) neutrinos with energy above EeV. These neutrinos are essential tools to probe the extreme-energy universe at all distance scales, such as the production mechanism of UHE cosmic rays. PUEO consists of horn antennas that operate at 300-1200 MHz range as the main instrument and a low frequency (LF) instrument dropped down from the payload. We will present the design of the LF instrument. The LF instrument operates in the 50-300 MHz range, and it is composed of an antenna array that is sensitive to radio waves emitted from air showers. These showers can be initiated by either cosmic rays or tau leptons that are produced from Earth-skimming neutrinos. We will present the expected performance of PUEO to detect tau neutrinos, including both the effective area and expected angular resolution. The LF instrument will be compared to the main instrument and the combined sensitivity of both the LF and the main instrument together.