are u using a hand held (in line seperate from the radio) swr meter, the built into the radio ones are never accurate. if you are topless there is always the roll bar. ok so does the antennae have a stinger that allows you to lengthen or shorten antennae length. (best swr match) how long is your cable and what rgu? you can go bigger like rg8, (j/k it's huge) you can lengthen shorten the cable, and run the cable in straight lines not all looped up. I've never been a fan of magna-toppers. I suggest a quick release mount attached to any length whip located at the rear of the vehicle. (military spec style) a spring is not necessary unless you go with one of those 108" jobbies.. 2:1 is very high and not acceptable in my world. good luck.