We also have a wired Garmin reverse image camera. It is mounted about halfway up the mast and has a good view of the aft deck. Here is the link to a post from another thread.
Trawler Forum - View Single Post - Do you really need a lower helm?
It was easy to install and plugs straight into the chartplotter.
At the time, I could not find any wireless cameras that fit our needs. The cameras are only wireless on image transmission side. They still need a power cable (which we did not have a good source for). A wireless camera would not connect to our chart plotter and we did not want to have to use a PC or a separate display to view the video.