Modifications

Wrong antennas design may ruin the communication below 10 meter.  

Wrong antennas design may ruin the communication below 10 meter.  

Great antenna design with attention to details will allow the RFM69 module to transmit data quite over 2 Km.

Great antenna design with attention to details will allow the RFM69 module to transmit data quite over 4 Km ([https://arduino103.blogspot.com/2025/08/cansat-rfm69hcw-et-communication-longue_26.html I tested it here] and [https://arduino103.blogspot.com/2025/08/cansat-rfm69hcw-et-communication-longue.html there]).

'''The antenna is the key to transmit data over a long distance!''' }}

'''The antenna is the key to transmit data over a long distance!''' }}