102" whip on 2020+ freightliner cascadia

It depends on where you mount the antenna. Just measure from the ground to the mount that will hold the 102" antenna. Take and add that measurement to the 102 inch length of the antenna, and that will give you the total height of the antenna. The biggest problem with this antenna is the weight of the antenna plus windload. You will need to use a heavy duty antenna mount.
Most guys use a 7 foot skip shooter with good success on the cascadia truck.

 

I use a 6 foot skip shooter with a Wilson heavy duty stud and I put a foot long length of small diameter PVC pipe down to the base, because of wind 6 or 7 foot antenna will sway like crazy and break at the stud.

 

Here's a good thread on this subject by mike5511.

Cascadia Antenna Solutions

Also lookup craigsez, he also has mastered the antenna problems with the cascadia trucks.

 

Not sure if you still need any info, but I found a picture of Craig's truck. He doesn't have a spring on his 7 foot skip shooter. Just a pvc over the lower part of the antenna, like what weasel did. If you use a shorter 6 foot skip shooter, then you will may need to add an extension to the heavy duty mount.

 

Very good, thanks for the update.

 

Do some bonding as well...As truck ages and parts corroid you will loose antenna efficiency..