Hello! I have a Firestik 18’ FireRing cable that I am installing in my Jeep. I noticed after running the cable that I inadvertently marred the unterminated end and need to trim it by about 1/4" to 1/2" to get a good connection to the PL connector. Will this adversely affect the performance of this cable and to what extent? Am I okay to use it 1/2" shorter or do I need another cable?
it will be just fine, you will not notice the difference.
Agreed with other responder. Cable length will not affect performance, especially if it is shorter You will be fine.