The state of the art for any non-ionospheric relatively high frequency radio transmission is how high the antenna pair are above their local terrain. Power inpu

The state of the art for any non-ionospheric relatively high frequency radio transmission is how high the antenna pair are above their local terrain. Power input, modulation, antenna type, these hardly matter in the face of a hill or a valley. The only thing that matters for 2.4/5 GHz wifi long range is height above surrounding terrain to get line of sight. The highest technology is literally the technology to get the antennas highest; ie poles, towers, tops of tall buildings, actively lifted (and powered) drone platforms for antennas, sides of mountains, etc.