A one-wavelength 160meter horizontal loop at 50ft agl is a cloud burner on 160m, better than a low dipole on 80m, but is the best antenna I have for 40m, where it also resonates. Good agreement between the actual antenna and modeling it. Not useful above 40m; too many deep nulls. I have enough land to lengthen it to two-wavelengths on 160m. Comparing the modeled patterns of the two-wl to the one-wl loop improves the pattern on 160m (more low angle radiation) but really screws up the 40m azimuth pattern. Since I am more interested in working 40m, I am going to leave it alone. The 80m pattern doesn't change much from 1 wl to 2 wl. Also doesn't matter hardly at all if it is fed in the corner or middle of a side.