I am trying to figure out where to bring the antenna coax through the cab at but am having a hard time finding a spot. The 2015 have rubber grommet by rear door but it does not go all the way through to the cab like the previous style trucks. Does anyone have any ideas?

 

I would go through the firewall if I ever put in a CB

 

This. There is always some sort of penetration from the firewall into the cab, on every vehicle. You just have to find it.

 

on my 13 I double foam taped my high mount brake light, and brought it in through there, never gave me issues, but wh alum mag mounts are useless , so ....

 

I brought mine in through the fire wall on the drivers side. Wiring harness boot has a place on the top side where you can poke a hole and run coax!

 

OP where did you mount the antenna I am thinking of doing an install but the antenna is what's holding me back.

 

I was told by dealer you can go through under to ac voltage convertor under the jump seat in back.

 

I mounted my antenna in the rear stake pocket.
https://breedlovemounts.com/stake_pocket_mount_2.html