In message , Richard
Harrison writes
Buck, N4PGW wrote:
"Is it something duplicable with Radio Amateurs in general or does it
require some special type of equipment?"

Much British success in WW-2 in eavesdropping on German transmissions
had as much to do with information processing as it had to do with its
interception.

snip

Stationary direction finding can take the directional antenna arrays
used for transmitting and use them for receiving insteaad. Reciprocity
means that the reception pattern is identical to the transmitting
pattern. I have no idea what the British did in their enemy reception
stations in WW-2. For HF, they could have used Yagi-Uda`s on rotators
and indicators.

Too broad a beam. Loop zeros are sharper.

They also could have used crossed loops or Adcocks,
feeding a goniometer and not rotated the antenna.

Correct.

U-boats used HF for reporting back to base in Lorrient, but MF for talk
among themselves in the Wolfpack. It was this that was DFed by the
shipborne CRT DF.

Mike