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 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 images below for a higher resolution).
Included with the reply was a promo card with a photograph featuring Bob Collins and Friends, signed by WGN business and agribusiness reporter Max Armstong.
The WGN Transmitter Site
The 750 ft. WGN antenna tower (Photograph Google Street View).
The WGN transmitter building (Photograph Google Street View).