If your just going to talk to people close by then your fine. The length of the antenna is more about distance. Example is when your adjusting your CBs SWR which is how you tune your CB to get maximum distance. When adjusting this you simply raise and lower the antenna till it matches. So cut it but dont expect it to get out that far. Also where you mount it has to do with the distance as well. If its a fiberglass whip then remove the rubber cap on the end then cut and put the cap back on.
