Question: how can someone achieve this kind of coverage? What kind of antenna, dbi need to reach that far from the purple point to the others is about 25 to 30 kilometers? :
What is antenna gain? - Find out more | NetXL Blog
Smart Guides Guide to Choosing a Mobile Antenna
Amazon.com: TNP 10 dBi WiFi Antenna - 2.4 GHz Antenna Network Compact Omni Directional RP SMA Connector for PC Desktop Computer Wi-Fi Router Camera Video Surveillance : Electronics
How Antenna Gain affects Range in FPV - Oscar Liang