YOU are the one with the antenna. You describe it as a " professional uhf magmount antenna" but give no photos or real description of the connector. You are given several answers, then ask the same question again, "What is the name?"
The name is......
FRED
Just go into a professional radio shop and say you need "FRED". If they happen to have a person named Fred, show him the antenna and ask him to give you a name.
chris