This is Part Two of a two-part documentary about black clandestine propaganda from the UK towards Nazi occupied Europe. The late Harold Robin explains why Canadian soldiers dug a hole in one of hills near Crowborough, Sussex and how the high power mediumwave transmitter sent from the US was buried underground. George Jacobs explains the mysterious Glenn Miller Jazz programmes made for German soldiers. Aspidistra, as the transmitter was called, could change frequency quite quickly and did more than broadcast fake German forces radio programmes. This must be the ultimate in "fake news" networks.
After the war, the transmitter was handed over to the BBC and later sent to Orfordness, Suffolk. Bits of the original transmitter survive in the transmission hall of that site. The original transmitter site in Sussex is now a police training ground. The photo shows the transmitter shortly after installation. The bunker was designed by an architect who built cinemas before the war.
You can find the first part of the documentary here.