Hello Jeff. A small transmitting loop (STL), or mag loop for 160m is possible, but some compromises must be accepted. I built a three-turn STL for 80-160m use about 12 years ago and have had good experience using it, mostly for SSB round-table use on 75m, and CW on 160m for contesting and DXing.? Programs like LoopCalc and 66pacific (on line) provide some design help, but produce questionable results (because of incorrect inductance calculations and other errors).
Rather than complain about problems, I created the STLcalc program to use correct, validated formulas, and to provide better ease of use where possible. You can get details by visiting my QRZ page (https://www.qrz.com/db/KB0YH). Scroll down to the coverage of loop antennas for pictures and program details.
73,
Gus Hansen
KB0YH
Augie "Gus" Hansen