You can't offer 9 dBi gain. I've noticed almost identical antennas here and on eBay with ratings ranging from 2dBi to 15dBi. I'd say maybe 3dBi is generous on a good day - it doesn't double the signal strength that 3dBi is supposed to do. But 9dBi. no way! Maybe for a specific group. but what? I salute the FCC for allowing you to pick any number without telling you how or why you picked it.
Bingfu Dual Band WiFi Antenna (2-Pack) for Ultimate Wireless Performance
11 Review
πΆ Hawking HAI6SIP: Boost Your Wireless Signal Range with Hi-Gain 6dB Omni-Directional Antenna
9 Review
Gadgets World FBA_ALFA ARSN19M OMNI Directional High Gain
9 Review
Asus RP-N12 N300 WLAN Repeater π 802.11 B/G/N - Boost Your Wireless Range!
10 Review
π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
4 Review
π uni USB C Hub with Ethernet Adapter, 4K HDMI, Gigabit Ethernet, and 3 USB 3.0 Ports for MacBook Pro, iPad Pro, XPS
11 Review