I'm using an 11dbi omni directional antenna with a tplink tl-wr841hp router and 20ft of L400 cable.
The antenna is mounted on a 20ft pole. Line of sight care.
I'm trying to send the signal 200 meters to friends around me but I'm only getting about 130ft and after 80ft I'm getting a signal but unable to connect.
How can I improve this setup?