Any on can guide me to built range booster for 2.4 ghz AP .
Omni anntena is also connected with AP but signals i can recieve around 700 to 800 meters. i want it for 3-4 KM

Thanks

3-4 kilometers? lol Good luck.
Normal router output power is between 15 & 20 dBm (32-100 mW). I don't think you can legally go any higher than 20 dBm (100mW) without a license on a class 1 device like a router. You might be able to get away with 36 dBm (4W) if you can figure out how to boost the signal that high. You would also need to modify your hardware to a different frequency, one that isn't used. 2.4 GHz is way too common. Therefore you would cause harmful interference with everyone else in your area and get busted by the FCC. I don't know a lot about this, so I could be wrong on some things. Do your homework (and there's a lot of it for a project like this).

How did you get it to 700-800 meters in the first place? That's really far.

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