Technology

Here's Sinclair: https://en.wikipedia.org/wiki/List_of_stations_owned_or_operated_by_Sinclair_Broadcast_Group

Here's Nexstar: https://en.wikipedia.org/wiki/List_of_assets_owned_by_Nexstar_Media_Group

Edit: *David Smith, son of the founder and currently CEO of Sinclair, has a hilarious entry-

In an August 1996 prostitution sting, Smith was charged with committing an "unnatural and perverted sex act" (oral sex) in a Sinclair company vehicle. He was sentenced to community service, which was fulfilled by having Sinclair station WBFF produce reports on a local drug counseling program.[14][15]

Aaaaand not so funny-

Prior to Ajit Pai's appointment under the first Donald Trump presidential administration as chairman of the Federal Communications Commission (FCC), Smith met with Pai to discuss deregulation of the FCC's media ownership rules. This meeting, plus Sinclair having been granted additional access to Donald Trump's presidential campaign, resulted in accusations that Sinclair was currying favor with the Trump administration in exchange for deregulation of the industry.[16][17][18] Smith met with Republican Party presidential candidate Donald Trump during the 2016 presidential election year, in which he told Trump, "We are here to deliver your message."[3]

Yeah, pressure at all levels.

You can also look at a local station's website and see advertising partners. Not the little fish that buy 1-2 ads a year for a local business, the ones that get their ads ran the most and in the best timeslots.

That's where pressure is best applied on affiliates

"The site that shall not be named"

... Do you have the slightest idea how little that narrows it down? (/j)