Mobile Device Featured Image height

The featured images on my website stick to the same height when on mobile devices. This can cause them to be very long on phone scrolling and annoying for the user.

http://oi61.tinypic.com/4tkha0.jpg

Is there anyway it can be responsive so as the screen gets smaller the height of the featured image gets smaller at the same rate so you don’t have to scroll through the featured image as you do at the moment?

Website – http://www.streetbusinesses.com