http://www.rightchannelradios.com/products/cobra-high-gear-fiberglass-cb-antenna
This is the antenna (almost the exact same)
And here you can see what type of "side mount" holder i used...
It is either a 5 foot or 4. Its been a while since the install. And it works great! My buddy and i used them on a long road trip and the reach was very good. I will measure tomorrow. It is mounted to the factory bolt holes where the antenna motor goes.
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