Hi,
Using a good dome camera might help. I have been using mono dome D25 CCTV camera ( http://www.technowavegroup.com/security/cctv/mono-dome-d25 ) of Technowave Group,Dubai for my backyard since 2 years and its working perfectly well. It contains weatherproof facilities with lenses from super wide angles to tele lens. If interested I can provide you the specifications of my camera.
Hope this might help!