According to USA Today,
Sinclair is in debt up the wazoo.
So, along with hitting the revenue stream, hit them on the outflow. Companies this leveraged must have access to revolving credit to cover their costs, and leave them a window. So lets slam that window shut.
I don't have the time to research this, but if anyone does, get a list together of the banks/firms that hold their paper, or have given them credit lines. Then if you have deposits there...look into moving them to another bank. Inform the bank exactly why you are considering taking your business elsewhere. Likewise, if you don't, let them know that you will not be considering them for any potential loans you may need.
Let them know the cost of your business is to stop doing business w/SBG. Get the revolving lines of credit closed down, and SBG will have to pay a premium for capital, or face going illiquid.