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I will depend on terrain, type of antenna, height of antenna and any other losses between the transmitter and antenna as well as properties of the receiving side.
We did some experiments in the past with a 0.1W FM transmitter feeding a dipole with low loss coax and mounted up two storeys high. Line of sight transmission range with still acceptable quality was up to 7km at some spots. Good consistent coverage was experienced up to 5km.
(in this case the transmitter operated between 88 to 108MHz)
The World record is more than 1 million Km per Watt, obviously scaled up from a lower power and distance!
So on that basis you could potentially reach about twice the distance of the Moon. (is that far enough?)
In normal situations, it depends on so many factors it's impossible to predict with even remote degree of accuracy, especially when you have told us nothing about frequency, bandwidth, antenna, path loss and receiver sensitivity.
I have personally sent FM video transmissions 40Km with 5mW of output power. That equates to 4,000Km at 0.5W.
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