Pros
It's a giant company that has solid benefits and isn't going anywhere anytime soon. They try as best they can to keep up with savvier competition, and keep investing. They also took excellent care of their employees during the COVID Crisis. If you are white, Republican, and very good at sales, there's really no drawback.
Cons
Let's put it this way: If you work for Sinclair in any capacity, you either agree with the Trumpy culture or have your morals take a backseat. The higher up you go, the more extreme it has to be. This results in a lot of racist management and decision-makers. During my 5+ year career in a multicultural market, not one POC was hired to any management position during any time, and almost every black person who left the company files an official report that they felt racially prejudiced. Even white, liberal, employees have complained about being politically targeted my management -- but the job can be so subjective, management can make up just about anything to fire you "with cause." If you have another solid choice and you're anything but white and conservative, I suggest taking the alternative.