Blackout WTF?

Tacked on at the end of David White's Raiders Notebook this morning was an attempt to explain the blackout for tonight's Raiders/49ers preseason game at the Coliseum:

Briefly: The television lineup gets a little complicated because the Raiders and 49ers run on different stations. The Raiders' broadcast will show on Channel 36 at 10 p.m. today and 7 p.m. Saturday. The 49ers' broadcast will be live on Sacramento's Channel 13 and Monterey's Channel 46, but taped on Channel 5 at 11:35 p.m.

Are the blackout rules different in the preseason than they are for the regular season? This it's weird, because the Monterey and Sacramento stations are showing the game live, which if normal blackout rules applied they would be unable to do. Also, isn't there a rule that a team's road games cannot be blacked out in their home market? So why is the 49ers broadcast being shown even later than the Raiders broadcast in San Francisco/Oakland?

This is retarded. Wikipedia has an explanation of blackout rules, but I can't verify if it's correct.

I was only planning on watching the first part closely, to see how JaMarcus looks, and to see if our defense can tackle anyone yet.

Instead, I'll watch the Olympics.