The exact range of RF waves? That's a good question. It cannot be answered accurately. Even with computer models. Estimates are all that can be had.
Variables that must be considered include (no, this isn't all of them, just the most important ones):
1.Amount of power generated by the transmitter.
2.Loss between the transmitter and the antenna.
3.Directivity of the antenna relative to the receiver.
4.Path loss / interference
5.Receiver antenna directivity
6.Loss between the receiver and the antenna
7.Sensitivity and bandwidth of the receiver.
That's the basics for any path, and moving the transmitter or receiver any at all in any direction changes the value for four of these variables.
Things, that is anything, moving around inside the path alters #4.
I have almost 30 years experience in RF, and I'd like to know the exact range of RF waves, too. Of course, I've also learned there is no absolute answer. Even the frequency of the transmitter must be considered.