Alfa AOA-2458-79AF is a new high quality, low cost dual band 9 dBi gain omni-directional 2.4/5 GHz Wi-Fi antenna with N-female connector. The gain is 9 dBi for 5 GHz and 7 dBi for 2.4 GHz. This has weather proof casing.
Can't adequately mount on a rail type antenna mount
Seems to be a good antenna. But when you're purchasing an outdoor antenna that will be mounted on an antenna mount, the N -type threaded connection is too short. You can't mount that antenna on a mounting plate tightening the collar from the bottom and have an adequate electrical connection. Disappointing.