I am currently working to improve my antenna on 160 meters. Currently I am using a 160-10m dipole on 160 meters but I plan to install a 1/2 wave dipole on 160 meters and/or a inverted-L antenna for 160 meters. I have worked 11 DXCC entities as of 10/10/2021 on 160 meters.
160 meter antennas:
https://topbandhams.com/tech-page/6-22-different-wire-antennas-for-the-160-meter-band
https://www.eham.net/article/21292
160 meter propagation:
http://www.spacew.com/www/160pred.html
https://k9la.us/An_Introduction_to_Operating_on_160m.pdf
https://www.youtube.com/watch?v=Nr-L-btjN1I
160 meters-General
https://www.mapability.com/ei8ic/contest/160m.php
http://myplace.frontier.com/~k9la/html/160m.html
http://audiosystemsgroup.com/160MPacificon.pdf