So the answer is…probably your D-104 will work with VOX just fine. I have found that the older the base the more likely it has the microphone out of line during RX, although at any age this is a rarity. If your microphone is factory wired and only the plug has been changed over the years then no matter what the base used you should be good to go, but since no new D104’s have been made since 2001 there is no telling who has had their hands inside that thing or for what radio it might have been configured at some time in the past. Some very old radios required this configuration, and some users preferred it even on newer radios. This is because the microphone element might not be in circuit during receive operation, and until the switch is pressed the audio from the mic never goes to the VOX circuit. If you have a D104 with a T-UG8 or a G base you might have to slide the clip up the switch bar, depressing the switch bar, for VOX to work.
The switch bar is on the side of the riser portion of the base, and this is squeezed to talk, there may, or may not, be a push-to-talk bar on the base.
The base of the microphone (such as model T-UG9 or T-UG9-D104 or T-UG8 or G stand) contains the push to talk switch (s) and the pre-amplifier if so equipped. The D-104 is just the microphone section, and not the microphone stand with key and base (there was even a hand held D104-M for mobile use). How it works and how the key on the microphone relates depends on how your specific D-104 is wired, there are many options to how they might end up.
Yes, D-104 mikes are/have been used with VOX capable radios. As nd5y said, any mic should work with VOX, VOX is a function of the radio, not the microphone. There are a couple of different questions being answered, and the answer quoted above makes an assumption.
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