The mount looks good but I am not a fan of the Fire-Ring Attachment but if it work then who am I to say otherwise.
The mount attaches well but there is no positive connection to ground and if you have been reading the latest posts on this site you will have noticed grounding problems were the culprit in all of the electrical problems.
First, what is your SWR, the most important thing when installing an antenna and especially on a CB setup is tuning the antenna.
IMHO… this is what I would do:
Drill a hole in the top part of the mount between the antenna mount and the bed rail mounting parts.
Attach a braided 3/8” strap using a ring lug, an external tooth lock washer and a nut to this location. (Don’t over-tighten)
Run the braided strap from that point to the frame.
Make sure to get to bare metal at all connecting points, used the hardware mentioned above and use some “No-Ox” anti-oxidation paste on and in between the hardware.
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter