I mounted mine like this (Cobra wx75st).
I ran the coax up and under the dash, under the door sill, under the rear carpet, into the cubby hole, and then out an existing hole that has a rubber grommet in it. Mounted the antenna on my tool box.
I ran the coax up and under the dash, under the door sill, under the rear carpet, into the cubby hole, and then out an existing hole that has a rubber grommet in it. Mounted the antenna on my tool box.

