Quote Originally Posted by The DB View Post
I would not recommend using an air coil in a vehicle, the metal next to it will throw off its resonant frequency and most people don't have either the knowledge or equipment to account for this.

I would recommend the slide on ferrite beads, if you have access to the end of the coax. I use shrink tubing to hold them in place when I use them, although zip ties that aren't over tightened work well as well. If you have no other option, snap on ferrite beads work as well, although they tend to be larger in diameter because of the snap on mechanism. With ferrite you can use as many beads as you want. I would recommend six or more. The specific beads you use are dependent on the diameter of the coax.


The DB
I ended up going with 10 of these beads on lmr400.
DX Engineering DXE-CB31-500-10 DX Engineering Ferrite | DX Engineering
I'm guessing that might be somewhere between 500 and 1500 ohms and should... maybe be resistive? I honestly have no real idea and just doing something rather than nothing. If I can get my ground loss low enough, this choke might be enough.

Now I'm running into rising swr readings as amp output increases. I'm kind of new to CB amps and the thought of signals exiting an amp that aren't on the desired frequency didn't even cross my mind. I'm probably going to try a low pass filter and see if it makes a difference.