Wireless Builtin Outdoor Cameras

Im working with a high end Client who's one of its requirements is to install outdoor builtin wireless cameras (fixed &/or PTZ ) to avoid any civil working considering the large scale of the project and the huge distances btw the cameras,

so what i know so far that there isnt any outdoor builtin wireless cameras except to use 3rd party tools (radio, access points,..etc) & also considering the instability of the signal its not that preferable.

id like to advise if you went into a situation as above, ever heard of an outdoor builtin wireless camera ? what manufacture ? and how would you approach the client for the same?

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