There are calls for a boycott. But it won’t be easy. You basically would have to pay attention to who advertises on your local station and contact them.
The television was on KOMO4 this morning (I didn't have it on KOMO - we were on HGTV and a L&O SVU marathon) so I think the girls changed it when they woke up and were making muffins) and after George Stephanopoulos was a commercial airing. The opposition to the merger paid for thirty seconds and Sinclair put 15 second spots before and after their ad time.) It was pretty awful. I can't find the commercial itself but here's a CNN write-up on it: www.kmjnow.com/news/sinclair-allows-critical-ad-to-air-sandwiched-between-its-defense-2/ (I like how Sinclair "lets" someone buy ad time.)
The whole sixty second segment was horrifying. Dark music, "don't let the liberal news media frighten you." Banner slides in patriotic colors about their news coverage...