It's all good , I got to learn something that I had never heard about these antenna's ,yes the cap is for SWR , I took it off and the match went in the red , I'll try a new one but this one does not show short or does it look burnt in anyway , so if that is the case ? I will be back to square 1 again , and now IM thinking it just doesn't like the cars I tried the antenna on. I will change the cap all the same to a new one and see , but up to this point , I doubt it. So IM also guessing that to much over 300 watts as they are rated at , those caps will go bye bye , but at least you would be able to take the mount apart and replace it if need be. Unless there's more to it then that and plus you could easily up grade the coax on these as well. Antenna's have never been a favorite part of this hobby for me , I sure like to have a good one that matches out and performs well , but knowing how and why they work has never interested me that much , radios and amplifers are more my speed , but hey , without the antenna and feed line nothing would really matter in the end , dummy loads are one thing antenna's are another. I keep saying to myself all the same , the lil wil is only a 30.00 antenna , how much can I truly expect at that price ? but ! 102 inch SS whip or a 96 inch fiber glass are only 10.00 and they might just be the best car antennas in the world. Go figure ........I God forgive me here , I forgot to mention the mighty I10 Ks , but they will cost you.