I replaced mine with one from Costco that I'm quite happy with, has a great picture on a 7" 16x9 monitor. It's not wireless, but comes with a 60' cable that wasn't hard to route. Has some nice features like a mike built into the camera and a speaker in the monitor, has IR so you can see in the dark. Also has input for 2 more cameras if you want side view also.
1 Backup Camera System with 7" LCD Screen by Rear View Safety