We fly on my gf's dads farm and there the only problem we have with sight is if you come in onto the gravel runway from the right you have mountains at the back and as soon as you level out the plane you tend too loose sight of it for a second or two even though its not that far away - everything blends with that mountain :P. Luckily most of the time when you do get low and have the mountain in the background is when you are coming in for a landing or doing a low fly by.

In normal flight we fly close enough not too loose it.