I couldn't help but notice a few responses in the thread speaking of needing line-of-sight. Unless you have significant hills for either or both antennas (TX & RX), then it is improbable that you can attain line-of-sight at 40 miles. For example if the RX antenna is near ground level, then the TX would need to be over 1,000 feet tall, just to account for the earths curvature, i.e., no intervening hills, trees, etc. VHF signals will "follow the earth's curvature" a little, but UHF, not very much and at cell phone frequencies you are pretty line-of-sight, where cell towers are typically spaced at 5 mile intervals, such that any given tower only has to reach out 2 1/2 miles to you. Part of the low cell range is low power, design to re-use same frequency nearby & time division schemes the set max range.
When they went to digital TV, transmitter power was dropped by a factor of 10X & sometimes even more. It is possible to pull weaker digital signals out of the noise than analog, hence the power reduction. It gave the added benefit of being able to re-use the same frequency for a not too distant station & not have the two interfere with each other.
Just interesting "stuff" that I ran across & found interesting. Hope you do too. :)
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