|If you go the wireless route you will probably need a repeater in between the router and the camera. Wireless at best is only good for approx. 300 feet. |
You might look at cameras that use a wired network, then you can use a device that carries the network signal over the AC power lines. It's called IP over AC. You can get these at Best Buy or any large computer store. They run about $50 bucks.
Have a look at some of the D-Link cameras, they come with software to stream the video to your smartphone.