Documentation of change from ELF transmissions to absence of ELF in Commercial Programming.

I submitted my FOIA request to the OIG of FCC office last Tuesday night and starting sometime this weekend I had no longer observed the ELF (Extremely Low Frequencies [<20hz]) spectrum usage on commercial Tele-vision transmissions over the digital air-waves in Chicago.

Here is photo documentation of before and after, of the rig setup with time and date stamps in the small screen and spectroscope in the larger screen.

700hz and below: Tuesday Feb 2nd 2021, [sic time was 12:54:37 CST]

700hz and below: Today Monday Feb 8th 2021, time stamp accurate to CST