This is my 160m vertical (mostly) T antenna. Because of my hillside location, I can only run radials NW and SE on my lot. This is a compromise antenna. I have run WSPR comparisons with Larry W7IUV. These tests shpw that Larry's antenna is 4-6 DB better than my T. This article provides some information regarding long vertical "T" antennas similar to mine. Note that this is a "stealty" vertical mostly hidden by the trees that hold up the horizontal wires.
160 is a special band for me; I have operated 160m since I first earned my general class license in 1963.