Fit is only the first check: The CHA UCM turns a sound table edge, rail, or similar support into a portable 3/8-24 antenna position and SO-239 feed-through. It is a clamp mount—not a tuner, transformer, loading coil, mast, or universal compatibility approval.
Documented relationships
- The current guide supports documented portable vertical or matching-unit installations on a suitable clamped surface.
- Do not mount CFM-34HD on UCM.
- Do not treat the clamped structure as a substitute for the intentional RF-return system.
- Physical 3/8-24 fit proves thread engagement only—not RF, power, thermal, wind-load, or structural suitability.
Interfaces to verify
- Choose a surface that can carry the complete antenna, leverage, coax pull, and wind without crushing, rocking, or releasing the clamp.
- Use the isolated top 3/8-24 stud only with a documented radiator or feed unit.
- Attach ring-terminal counterpoise wires to the side screw when the antenna requires them.
- Banana-plug radial products need a separately documented banana interface; they do not plug directly into the UCM.
What compatibility does not mean
- A matching thread or tube diameter does not prove structural capacity.
- A stable mount does not replace the required feed, matching, radiator, or RF-return components.
- An adapter does not transfer the highest rating of one product to the rest of the chain.
- Use the exact antenna, height, load, wind, and guying limits from every current guide.
Use the current CHA UCM instructions.
