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The most reliable way to sync multiple transmitters in close proximity, say a couple hundred feet or more on the same freq is to hard wire them together with balanced audio lines like this:
… Only way to get near precision sync.
Otherwise, you will have to separate them wirelessly by the distances where the signal starts fading each way between, with good TX’ properly tuned. This means you will need to send your audio via microwave, digital wireless LAN, etc., with AD/DA converters like Barix Instreamer, Extreamer, or maybe used computers, maybe 802.11 WiFi sets at each end from the base, directional antennas (dish) … and even then there will still be enough difference between the TX’ signals to cause a beat or flutter in the crossover zone(s). Won’t last long if you’re driving, buy not so good for listeners sitting in the zone.
Obviously the way out of that dilemma is to use different frequencies, as most commercial FM station translators do. The signal will be close enough since they don’t have to be perfectly sync’d, but listeners will have to re-tune frequencies when traveling between. The key is to throw regular announcements as to frequencies to use in coverage area locations into the program content along with whatever other publicity you have to get the word out.