On another note, for some reason, this station gets the worst Nielsen ratings. Do they use PPMs or diaries? Anyone know?
49 of the top 51 markets use PPM. The only significant market that does not have PPM and still uses the diary is Puerto Rico, a top 20 market.
San Jose is part of the San Francisco PPM market, but is also broken out as a separate one. Of course, it uses PPM too.
From the wording of your question about them "using" PPM or diaries I probably should point out that a station uses neither. Nielsen uses one system only in each market. The large markets can afford the very much more expensive PPM, and the smaller ones can not and get the diary system.