For UHF & VHF we are usually talking line of sight for how far away someone can hear me on their receiving radio with no obstructions. That range with antenna 6 feet off the ground is 3 miles. At 50 feet above the sourounding area it would be 20 miles.
They also say in theory that two similar antennas each have there own line of sight. So in theory both can go the distance of line of sight so 3 miles is 6 and 20 is 40.
Now remember the interference and other issues, so be excited if you get the full 3 or 30 miles mentioned above.
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