For straight, consistent shots, let your arms hang at address. 

You virtually never see a top pro extend the arms and reach for the ball at address—but you see amateurs do it all the time. It’s a common cause of slicing. 

Your arms should hang under your shoulders and feel relaxed. Your wrists will already be semi-cocked, so you can simply maintain that wrist cock as you swing back. Your hands are closer to your body for leverage. Through impact the club stays along the target line longer. But if the club and your arms are positioned higher, forming more of a straight line and extending toward the ball, you feel tension in your shoulders. Your wrists will cock inconsistently. You will come across the ball, making it hard to square the club and turn it over through impact. 

So set up with your arms hanging naturally. You should be looking in at your hands, not out at them. Then try to return to and through that position. Don’t feel as if you’re reaching for the ball at address. I’d rather see your hands too low than too high.