Stock CB antennas, worth replacing?

I have a 2022 Volvo VNL760 with the stock CB antennas. I was just wondering if I'd gain much by getting different antennas. I have a Cobra 29LTD Classic radio. All that said, I seldom use my CB. But, on 2 lane highways and during inclement weather I do use it. I use it on 2 lane highways in case someone creeps up on me and needs to get around me. Try to coordinate with them on leap frogging them around me so they can be on their way without being stuck behind me. During inclement weather to hear any road conditions, etc.
But, not really into being on the CB jack jawing and the like. It is an important tool at certain times. I'm just curious if those stock antennas are adequate and not worth the (up to a) couple hundred bucks it may cost to replace with better ones or if it wouldn't gain me enough performance to be worth the bother. I simply don't know.

 

Thanks you your reply!
1. I'm pretty sure, but not positive, that my antennas are both for CB and not satellite radio? Probably a simple T connection hooks them both together. Since I'm a company driver, probably not a great idea to go rummaging through the wires to determine how and where they are T'ed together. There's a couple of our garages where I know the mechanics and I'll probably ask them about it next time I have a chance. They may not know, but they may.
2. As for my SWR, my Cobra has both a built in meter, an SWR adjuster knob and a procedure to measure and adjust the SWR.. Much nicer than back in the 70's when you had to use a tiny Allen wrench to lengthen or shorten the physical antenna length to adjust the SWR. According to the built in gauge, my SWR is under 1.5, but hard to distinguish how much. That said, unsure if I should purchase a separate SWR meter and go that route. Although if I used an external SWR meter, unsure if the built in SWR adjustment procedure would still be valid and if not, how I'd adjust it. My thinking, based on my understanding of SWR (I do understand it probably better than many as I was an electronics technician and did deal with rf stuff. But, I admit I do not have a through understanding, only a general one about the theory regarding SWR, what it is and why it's important. My rf experience was for receiving, not broadcasting), is that the existing built in procedure to adjust SWR would probably still work the same. These antenna don't have the little allen wrench adjustment found on antennas in days of yore.

 

I'm positive I could change the antennas if I wanted. I've seen several others that have changed theirs. Also, I may have a bit more leniency with those kinds of things than many other drivers. I've been with Swift over 2.5 years, a long time by Swift standards. And, worked out of the same terminal and with the same management folks the whole time. They know me, I have a good reputation and I know they will be as lenient about those kinds of things as they can be. I've already received 'special treatment' in regards to some other stuff. One of the reasons (not the only one) I'm still with Swift. They take good care of me!!