Cascadia Antenna Solutions

Something like the crude paint i just did..Grey being a mount bracket on the 40"ic tall mount and red being downward ant..

 

If I were you, I'd copy @volvo244t setup to the letter.

 

lilillill...Just thinkin outloud...
I already own enough to do as volvo244 has..I got a 5 ft top mounted fire stick(with tuneable tip) and a non tuneable tip 4 1/2 fs ant with a cpl of same mounts and studs with wilson mirror arm mount..

Not seeing any long haul till after my treatment next thur,so i cant get my 7 ft skip shooters till im on my way home the following week..
supposed be be rain free tomorrow(my b day)ill be doin that trial and some beers as i try..

 

Might have been easier to con my boss into puttin a moose bumper on my truck and puttin an ant on that..lol

 

Your idea of the 4 foot downward antenna might be better than my shorter one. Even with the shorter antenna having the antenna at the same angle as the upright antenna worked better for not slapping the fender when opening the door. I used a bar mount designed for slip seat operations, just moved the antenna connectors as needed, so it put the lower antenna closer to the fender. My swr improved immensely when I insulated the antenna from the truck. I've tried it with several antennas now with good results swr wise. The only one I had a problem with was the 102" whip. I later figured out the reason was I put the 102" directly into the mount forgetting most installations use a spring mount. Added a 10" Wilson shaft extension and that brought it down to 1.4 right away with no trimming It would just be too tall at that location. With the 7ft skipshooter and pvc sleeve at the base the antenna bows up fairly vertical at highway speeds.

 

Upright not grounded.
Downward grounded to plate isolated from truck.

 

That was the radio that got damaged in shipping

 

Or something like this

 

It's funny how Bob's CB has some real nice stuff, but they try to talk you out of buying it. "Oh that's for RVs, not trucks." "Oh that antenna was made for certain trucks." LOL.

 

With the wind load would this mount be robust enough for a 7 ft skip shooter?