LF antenna

Might this be an antenna for RFID? In that case, you may also need a 125kHz RF module for producing that 125kHz signal to the antenna.

Or might it be that your "antenna" is a complete module+antenna? In that case, this module must have some interface. But only you would know what module it is, so only you (or the manufacturer) would know if it interfaces on RS-232, USB or is expected to be connected to raw digital signals. And in the last case, if these signals are intended to use 3.3V logic or 5V logic or maybe even something else.

Might this be an antenna for RFID? In that case, you may also need a 125kHz RF module for producing that 125kHz signal to the antenna.

Or might it be that your "antenna" is a complete module+antenna? In that case, this module must have some interface. But only you would know what module it is, so only you (or the manufacturer) would know if it interfaces on RS-232, USB or is expected to be connected to raw digital signals. And in the last case, if these signals are intended to use 3.3V logic or 5V logic or maybe even something else.

Or an RF module for receiving that 125kHz signal from the antenna;

Or an RF module for both transmitting and receiving - commonly known as a transceiver.