factory coaxial location on 2016 cascadia evolution

Factory dash mounted....
I don't know about all that, but my '16 radio is right above my head. Think there was a removable sun glasses holder in that spot for people who'd rather have handy sunglasses than a CB.
Anyway, the coaxial on it is inside there, and it goes to some sort of internal antenna somewhere, which makes your radio about as effective as yelling out the window.
Don't know if that helps you any, but it helps me to vent about Cascadia's once in a while.
Really wish the megas would ditch these heaps.

 

Antenna is above your head like toymaker said. Coax probably runs down a pillar through dash to the mount.