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Many of us mount our radio gear outdoors in places where we need to have it be as unobtrusive as possible. Gray is fine; especially a light gray. Other possibilities would include off-white or light tan. Even light blue should be fine. It should be a colour that tends to blend in with the sky or the surroundings. For that reason I would avoid any bright or intense colours. I would also avoid black, since it will absorb a lot of heat in bright sunlight and make the box extremely hot, which would be bad for the innards. Pale, lighter colours would do better in this regard. Orange would definitely be a bad idea, though, in my opinion.
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