I'll go one more step...
My local Sheriff's system is a voted, simulcast system.
There are 5 sites...one is the "hub" where the voter is.
All 5 sites have a repeater, which is "split", in that the receiver sends it's signal back to the voter at the hub via a leased pair phone line, the voter decides which receiver has the best signal to noise ratio and "votes" it, then sends the audio, and control signals via an RF link back to the 4 outlying sites (and locally, in cabinet, on wire to the Hub site TX). All are GPS clocked, so they transmit in sync. No matter where you are in the coverage area, you hear all traffic equally.
It actually works well. I think they are ready to move on to a bigger system one day soon, but this one has served them well for about 15 years. There is a phone line or level issue now and then, but the system is very forgiving with mobiles, so really portables is where you would notice one site being out.
They also have an alternate input PL on each site, so you can use just that repeater as a fallback. They also have 2 "tactical" repeaters which are single site...but rarely use them. They don't seem to know how to use anything but "channel 1". Once in a while someone use talkaround and thinks no one can hear them...lol....instead of using the simplex channel they have for car to car. It all comes down to training.
And...almost forgot about the "repeater-repeater". In the office building, there was poor portable coverage. So the radio shop has a different channel in the portables they can go to, and on a separate freq pair there is a 10 watt repeater, it is linked to a control base, which is setup like a mobile and talks into the main system. Any traffic over the 10w repeater goes direct to the other portables, and the system...likewise any system traffic goes over this 10w repeater too. The control base has a remote sitting by the console which serves as an alternate in case the console goes down, or the wireline from the console to the hub is out. I think the control base has talkaround in it too, just in case. Sounds like a mess...works good, and the audio is great, you would never know.