Electrical Radio capacitor

That’s a harder problem. The Accessory ignition key position will help rule out ignition EMF. I assume the accessory position is when you get the stations. The noon box and Job Site (wireless hot spot cellular thing???) would be easier as a red herring. I am wondering if there is something wrong with the antenna hook up and ground. Something else using it as the ground could help explain stations dropping off. It will not explain interference in other items. The MSD box and accel coil might. Can you unplug the box and see how reception is?
Also, does the radio play CD’s or AUX input work when the car is in the run position?

Have you checked to see if there is a signal jammer under the seats or in the trunk? It might have been a spy or government vehicle.

As was said above, unplug the ignition box and turn the key to the run position. Then report back.
There are only a few things that are on in run that are not in the Aux keep position. Another is often your fan motor. But that’s easy to switch on and off, and would usually make electrical noise.