From 1946 until 1958, WTCB/WTAC/now WSNL with a new TL, less power, and a different pattern, was clear in most of the LP and some of the UP. When WLST 600 Escanba came on, that changed. Originally WLST, now WCHT, was 1 kW from a three tower in line array in Ford River, and for a few years, didn't bother it much. They must have let the nulls out before moving to a two tower array West of Escanaba, with less power, and then had a PSSA, but the nulls were shallow. Probably you could null it out with a loop. What kind of antenna and receiver did you have in Omena?