In Utes and Chernarus you see this mountain range on the horizon, other people also call it “skybox”. It looks nice on Chernarus… however it is applied by default in ArmA 2 for all terrains including user made ones. So if your terrain features does not reflect mountains in certain compass bearings, it might look odd.

Here is how to remove it. This is the stand alone addon config how to do it:

class CfgPatches
{
	class VTE_skybox_remove
	{
		units[] = {};
		weapons[] = {};
		requiredVersion = 1;
		requiredAddons[] = {};
	};
};
 
class CfgWorlds
{
	class DefaultWorld
	{
		class Weather
		{
			class Overcast
			{
				class Weather1;
				class Weather2;
				class Weather3;
				class Weather4;
				class Weather5;
			};
		};
	};
 
	class CAWorld: DefaultWorld
	{
		class Weather: Weather
		{
			class Overcast: Overcast
			{
				class Weather1: Weather1
				{
					// sky = "ca\data\data\sky_clear_sky.paa";
					// skyR = "ca\data\data\sky_clear_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_clear_horizont_sky.paa";
				};
 
				class Weather7: Weather1
				{
					// sky = "ca\data\data\sky_veryclear_sky.paa";
					// skyR = "ca\data\data\sky_clear_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_veryclear_horizont_sky.paa";
				};
 
				class Weather2: Weather2
				{
					// sky = "ca\data\data\sky_almostclear_sky.paa";
					// skyR = "ca\data\data\sky_almostclear_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_almostclear_horizont_sky.paa";
				};
 
				class Weather3: Weather3
				{
					// sky = "ca\data\data\sky_semicloudy_sky.paa";
					// skyR = "ca\data\data\sky_semicloudy_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_semicloudy_horizont_sky.paa";
				};
 
				class Weather4: Weather4
				{
					// sky = "ca\data\data\sky_cloudy_sky.paa";
					// skyR = "ca\data\data\sky_cloudy_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_cloudy_horizont_sky.paa";
				};
 
				class Weather5: Weather5
				{
					// sky = "ca\data\data\sky_mostlycloudy_sky.paa";
					// skyR = "ca\data\data\sky_mostlycloudy_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_mostlycloudy_horizont_sky.paa";
				};
 
				class Weather6: Weather5
				{
					// sky = "ca\data\data\sky_overcast_sky.paa";
					// skyR = "ca\data\data\sky_overcast_lco.paa";
					horizon = "pmc\vte_skybox_remove\data\vte_sky_overcast_horizont_sky.paa";
				};
			};
		};
	};
};

And you obviously need to edit the PAA textures. There is alpha channel transparency included in the textures so be careful with them.

You should also check out Rellikki's desert sand storm type skybox texture addon, it makes very nice visual look for all desert terrains.