I think you must have missed my original posting.
The smaller receiving Delta loop optimized for 160 meters is by
Earl K6SE (sk) and is a K6SE paper is posting on eham..
It is in ON4UN "Low Band DXing" books. In the fifth edition,
it no longer mentions Earl, but it is called a " Delta Shaped Loop" Page
7-104 Chapter 7.
It is the smaller receiving loop.
It is undesirable to believe a proposition when there is no ground whatsoever
for supposing it is true. - Bertrand Russell