If the air dams are fibreglass there's no reason why you can't mount on the top of the roof and have the whip protrude through a discreet hole in the air dam.
Back of the cab is OK as long as you can get almost at the top of it so as little of the antenna is shadowed by the body as possible. The hood is a good option if its bonded well and the front fenders as a second choice although you want to be doing it on the drivers side for pedestrian safety.
Sitting ducks pics of his rig are a good example of how alot of trucks are built here in the U.S. He has a high top sleeper, meaning inside the cab and sleeper are open to the top of the air dam, that are mostly made of
fiberglass. Truck hoods are also made of fiberglass. The only metal in the whole body is the cabin shell, which are aluminum. Some of the "bolt on" sleepers are even fiberglass.
So, if we're not allowed to drill holes in our trucks, and/or everything else is fiberglass, we really have 2 options.
Back of the cab, using existing holes, or the mirror arms.
If one were to mount an antenna on the back of an aluminum cab, in the center, and as close to the top as possible. What would be the difference in the way sitting duck is mounting his on a perch mount, or mirror arm, and bonding everything? Wouldnt it basically be the same? The
antenna is still off the side of the cab, whether it be the side, or the back.
I'm just generally speaking here, for someone just running a barefoot radio, or maybe a small amp. Not a kw of power.
Sorry, not trying to hijack the thread. I've often heard mirror arms aren't the best place to mount antennas, just never knew why. Mounting options are very limited for most of us.
Looking good so far there sitting duck