Anther cascadia antenna issue

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I have a 2016 cascadia, with the mirror mount. I have it and a 2 sererate wilson antennas. One 5 ft cut to tune and a 3 foot tune tip. I had no luck with the 5 footer and the 3 footer is better but still high on the swr. On the 3 footer I have the swr to about 3 on Ch 1 and 3.5 on channel 40. I can't get it any lower. Now if I touch the antenna while testing or transmitting it's between 1 and 1.5 on 1 and 40 respectively. Do I need to add a ground? Or do do I need to try a different setup or a different mount location?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.thetruckersreport.com/truckingindustryforum/threads/anther-cascadia-antenna-issue.413460/

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