Changing over a UHF but keeping the Coax/ antenna

That's what I did when I upgraded from a POS Uniden to an Icom (with speaker mic). The Uniden had never worked properly & many 'experts' had advised me that it was a cabling/antenna issue & suggested a variety of ways to resolve this, none of which worked. Replaced the Uniden with the Icom, & changed nothing else & it worked perfectly & has continued to do so for several years now.

I think they all use standardised specs for antenna cable and connectors, but am open to correction. If they do, then your coax and antenna will be fine.

FWIW, I changed from a Uniden set to GME and have successfully used the Uniden coax and antenna, no probs.

All CBRS (UHF CB) VHF use 50 Ohm impedance coax cable. In australia ! there are soem insatnces when 75 is used but that's beyond this application

Connectors may however change. Most will be a screw on style PL259 comes to mind, all depends on who supplier and manufacturer calls it - some are crimp style others are solder style I use crimp style some are two piece others are one piece (two piece refers to a separate conductor pin )

first thing I normally check is condition of the connector itself - simple check to ensure no short circuits between conductor and shield get a DMM with piezo alarm fitted.

Short out test leads and buzzer sounds. put one lead onto middle conductor and other onto shield outside of connector. It shouldn't make a sound.

Some antennas do have a earth ground installed to reduce static from lightening strikes in the air but you need to consult manufacturers specs on this aspect.

Also pays to ensure type of antenna being used is suited to application some are ground dependent best fitted into middle of roof (hole drilled into roof) and others are ground independent, these usually have a load coil at base of antenna.