Update README.md

README.md

@@ -45,7 +45,7 @@ All work was done on ESP32-WROOM with custom made LoRa shield, if your ESP32 boa
 - Antennas
   - Client: rubber duck antenna or mobile antenna on a car roof
   - Server: 7 element UHF yagi indoors
-- Range (20 KHz channel width and 11 spreading factor, also got similar results with 125 kHz and 12 SF)
+- Range (20 KHz channel width and 9 spreading factor, also got similar results with 125 kHz and 12 SF)
   - **About 7 km** when server is 30m above the ground and client is 2m above the ground with rubber duck antenna or inside a car
   - **About 13 km** when server is 30m above the ground and client is at some higher point ~40m above the ground with rubber duck antenna
   - **About 17km** maximum (non-reliable) between base and mobile station with antenna on the car roof