WGN Chicago IL on 720 kHz made it through to Fish Hoek on the 26th of February 1989. The station was heard over a distance of 8 517 miles / 13 707 km via the FRG7 and 25 metre longwire antenna.
I was fortunate to receive a QSL card in response to my reception report (click onto the relevant images below for a higher resolution).
The WGN Transmitter Site
An impressive aerial view of the 750 ft. WGN antenna tower in the foreground with the 250 ft. self-supporting auxiliary antenna tower behind and the transmitter building on the left (photograph courtesy Bart Shore).
Another aerial view showing the WGN transmitter building (photograph courtesy Bart Shore).
The WGN transmitter building (photograph Google Street View).