For my studies please. I haven't been able to get a clear theory of operation for antenna lead-in protectors used on coaxial cable. I think all the manufacturers want to say the basic operation of their product is proprietary. Can someone tell me if my understanding here is right? If so, have you seen a manufacturer or authoritative publication that actually explains it well? Most electrical education programs just explain that they are required, where they are to be installed, and maybe a basic of that they protect from strikes. They don't explain how they do this.