Install vdr-plugin-femon by entering the following commands in the terminal:
sudo apt update sudo apt install vdr-plugin-femon
Description:
DVB frontend status monitor plugin for VDR
DVB Frontend Status Monitor (femon) is a VDR plugin that displays signal quality parameters of the tuned channel on the OSD.
Homepage: http://www.saunalahti.fi/~rahrenbe/vdr/femon/
Version: 2.3.0~git20170108-1
Section: universe/misc