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I am the manufacturer of my antenna, which consists of a camera tripod, a mounting bracket, a variable coil, a 9ft telescopic whip (or an Ampro 20m whip) and a counterpoise wound on a camping washing line reel.
Both set-ups work without issue when mounted on the car (counterpoise or radials negated by the car itself).
I did think about shielding the v6 in a case, then I couldn't understand why the metal case already employed was not sufficient.
I'm going to slap some ferrite beads on coax and see if that fixes the problem. I have built a choke for my home End Fed Half Wave, so I may try that too.
Thanks very much.