Eli Polonsky said:
Beaming due east (and out to sea) from Waltham, 1510 has a decent signal in Newton, Brookline, Belmont, Watertown, Cambridge, Allston/Brighton and most of the City of Boston, some of the cities and towns most likely to have an audience for the program in the area, where the 1430 and 1200 signals were weak in the daytime and practically non-existant at night.
Technically, WWZN does NOT beam due east with either its daytime or CH (critical hours) patterns. The two-tower mid-day pattern is not very directional at all and is oriented at 61 degrees true--closer to northeast than to due east. The CH pattern, which uses the same two towers as the D pattern and therefore has the same orientation, is a modified cardioid that reduces radiation to the southwest to the equivalent of ~1 kW ND to protect WLAC from daytime skywave. The night pattern is, in fact, oriented pretty much due east, and restricts radiation the the west and southwest even more severely than does the CH pattern.
During January, the D pattern doesn't go on until 9:15AM so Santos will be on N pattern from 6:00 to 7:15 and on CH pattern for the remainder of his program. In December, the CH pattern is on from 7:00 to 9:00AM and from 2:15 to 4:15PM.
I wonder whether some anyonymous right-wing benefactor might not be paying for the air time on WWZN so that the righties can claim that Progressive talk does indeed air in Boston on a 50 kW commercial station and that, therefore, there is no need to resurrect the Fairness Doctrine--something the righties seem absolutely paranoid about but which President-elect Obama has stated he has no interest in doing. If I've correctly figured out the reason for and source of the funding for Santos et al, the Progressive talk will be gone from 1510 in six months for sure and quite possibly in three.