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What I’m saying is to instead take that money and install a second transmitter aprox 1 mile away (thus 1/2 mile beyond the first transmitters signal range), the result being that you double your range.
This would be a great experiment, but here are some thoughts on it…
For prevention/reduction of mutual interference, units in this approach using the same frequency will need to be separated far enough from each other so that they have useful signals in their separate coverage areas — despite operation of the other setup(s) in the system.
A radiated field does not drop to zero at some specific distance from the transmit antenna. So the groundwave field at 1/2 mile will be reduced to < 50% of that field at a distance of 1 mile.* This can cause significant changes in the net field received from the two stations at some locations, and distortion in program audio, even if the carrier frequency and modulating waveforms are synchronous at each transmitter.
Inadequate physical separation will lead to some significant signal variation or maybe dead zones between adjacent transmitter sites.
About the only way to overcome this is to physically separate the two transmitters so that their radiated fields have no practical affect on each other.
* depends on frequency and earth conductivity