Oceanic OCEALED40120B2 Guide D'utilisation page 58

We recommend you use a 75Ω antenna cable so as to eliminate the
disturbance caused by impedance mismatching. The antenna cable
shall not be bundled together with the power cord.
Directly insert the 75Ω antenna cable plug into the antenna socket when
applying cable television.
Note: The antenna should be checked periodically. If clear image is not
available, shut down the power and then carefully check the antenna.
Connecting Cables
This TV has digital multimedia performance and can be connected to
multiple external devices. The following diagram presents the
connections to other video and audio.
EN-11