no spam wrote:
"For 690 KHz that would be 2850 feet of wire, just over 1/2 mile of
wire."

Something like that. The site was a shortwave broadcast plant that had a
rhombic aimed at New York for last ditch program relay in case all else
failed. It was located at a far corner of many acres to be well out of
the shortwave field. As we were not last ditching it, I borrowed its
open wire transmission line, shorted it and fed it to my medium wave
receiver. It worked like a champ.

Best regards, Richard Harrison, KB5WZI