Re: VHF noise / squelch
Worked before the splitter, doesn't work after the splitter?
Simplest troubleshooting, uninstall splitter, see if it works again. If you CUT the antenna cable and installed new fittings to accomodate the splitter, it could just be a bad fitting. Crimp or solder, they all have ways to fail.
If you cut the antenna cable and installed two new male fittings? Yes, you'll need to spend two bucks on a female-female fitting to rejoin them. That's a useful thing to have around anyhow.