[Devanmc]

There are some that use wifi but they can be a bit complex to setup. They would fit the bill well though. They may also have security risks like remote access from outside users, but i doubt your barn has stuff where someone would be looking to hack your security camera. Remote access camera are very easy to find just with google(Ill let everyone else do the looking), so if you go that route, please set it up carefully.

http://www.newegg.com/Product/Produc...9SIA2U20Y31595