In this video, I open up the Commradio and inspect the components inside. The CR-1a was available from Universal Radio Inc. and uses BNC connectors for its two antenna jacks. I noticed that when I wiggle the antenna wire, I was hearing a noticeable crackle sound, almost as if there was an intermittent connection. Here is the inspection of my CR-1a.
As it turns out, there was nothing wrong with the CR-1a. The cable connector was at fault.