Here is a pic of the brake light section. The wires turn straight left pretty quickly (passenger side brake light).
One big thing to note. The sidewall stops short in the back corner. The rear wall goes all the way from passenger side to driver side. That tube gets screwed into the last sidewall tube...so you're going to be dealing with those screws when trying to run anything larger than wire. (as in pvc tube).
There is a tube on the driver side next to the tail light that we use to run wires...but that one already has wires. If its just the coax line of the antenna it should work...but I don't think you're going to get 1/2" tube in there.
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