I just installed a cobra 29 lx with a 3' firestik ii on my jeep. I am trying to set up the SWR. Followed instructions in the manual and have 1.2 SWR according to SWR meter integrated in cb (don't have a external meter to check) on all channels. My question is regardless of how I adjust the antenna tip (shorten or lengthen) it doesn't change doesn't go higher or lower. I would assume that it would change the SWR some when adjusting the antenna. Is this normal or do I potentially have a problem