Hey Pesk92,
if normal anti alaising is disabled for mobiles, you could try to render the scene in a higher resolution by using ‘r.ScreenPercentage 150’. This means your game will be rendered in 150% of the max screen size. Another solution is to distract the user from the anti alaising effect by making the picture more lively. For example beside your farm house could be a working windmill, leaves could fall from the trees or some dust particle effects moving around.
Hope it helps