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Below is a computer simulated graphical plot of maximum possible receiver coverage using the Longley-Rice Prediction Method adjusted for a very weak receive signal (.2uV for 20dB quieting) which best approximates some of the weakest signals heard from the most common distant locations.

Note: it is not unusual to hear signals outside of the red zone depicted, but those are due to non line-of-sight propagation modes which are variable and unpredictable due to weather and various secondary propagation modes such as RF Ducting, Knife-edge , and E skip (ionospheric bounce). 

Online Prediction Software provided courtesy of Communications Research Centre Canada  - An Agency of Industry Canada

 Legend for Signal Strength vs Color (Dark Blue/Grey is Strongest, Light Blue is the area for weakest signals to be received from)