Datasheet
What ranges can I expect for RFM69 radios?
The RFM69 radios have a range of approx. 500 meters line of sight with tuned uni-directional antennas. Depending
on obstructions, frequency, antenna and power output, you will get lower ranges -
especially
if you are not line of
sight.
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https://learn.adafruit.com/adafruit-feather-32u4-radio-with-rfm69hcw-
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