102" whip on 2020+ freightliner cascadia

Its a ground issue with swr like that...Run antenna at approx 45 degrees as well otherwise your getting cab reflect and it will be way over height.....
Fellas will make fun at the 45 degree angle but when you get rollin it will bend and sit straight up(depending on speed and wind)..
Post a cpl pics of antenna mounting..

 

Get a multi meter out,set on ohms and keep testing different points to see if it has to much resistance....
You did clean it down to metal where your straps are on right??

Vids on youtube to show how to test for antenna ground..

 

Hold off on the bolts....As long as your copper ends sit flush and the washer on the bold sits flush you should be good....
You did put that black plastic washer on the bottom of the top side of stud correct??

Also bbi on youtube has some nice vids on bonding..Worth watching..

Make sure on your radios software that you have the swr and voltage protect set....

 

Kinda wondering if its a coax short..

 

Did you attempt to adjust the nail on the top of the antenna?

JD

 

Are you using an external SWR meter?