In the late 1960s, WMEX received a power upgrade to 50,000 watts daytime, still with 5,000 watts at night. Station engineers had to constantly adjust the phasing network as tides in the Neponset River would play havoc with the station's directional pattern. However, the saltwater marsh area provided the station with an excellent coastal signal. While the night signal could not be heard clearly inland at many Boston suburban locations (especially in the growing and affluent western and southwestern suburbs), the station's nighttime transmissions were heard very clearly across the water to the Boston city neighborhoods and the working class North Shore areas. The saltwater path nighttime transmissions reached up to Nova Scotia and Labrador, gaining the station an audience in those areas, as well.