Multiple transmitters can cover the area you need if one transmitter won’t do the job. The most common method people are using to cover a larger area with multiple transmitters is place Rangemaster transmitters around town and link them the audio by Internet, when using this method there are some important things to know. First you need to keep your audio in sync, even a few tenths of a second delay of audio between the transmitters will cause a noticeable echo as a person drives between transmitter zones. Second, the RF carrier is not in phase sync using this method, the transmitters will not heterodyne (you must use the module controlled model) but the PHASES of the carriers will not be synced. Normally you will have a short zone of “flutter” as you drive between zones, not too noticeable, like driving under a power line. However if you don’t do a good job of planning transmitter locations and get the transmitters to close together then the flutter will become worse. Do not try to use other (PLL) type transmitters with this method!
We recommend first of all using a good technical person that has worked with radio before. A good technical person can get more legal range just because they understand radio. What we recommend when setting up to cover an area is to put in one unit first to get an idea (test setup) of what kind of range you will be able to get. Then design the location of the other units with the range of the first in mind. Range will vary widely according mostly to ground quality, installer skill, height, noise floor, ect.
