Wow, a bunch of interesting posts. I think, even though we have done a lot of proofing, we are probably still vulnerable. The strange thing is you can go for several years with no problems and then a predator decides to get in and you have to deter them or give up. I think making your coop as predator proof as possible is the best course because once they know there is easy, high quality food there it is hard to deter them. I am thinking of an electric wire to deter them, preferably solar powered. Any good recommendations?
Like okallthis said, go to Tractor Supply. I got a solar charger jobby thing and asked the folks there for help. I explained what I needed and they essentially walked me through everything, picked out everything I needed and gave me a few ideas of how I'd want to set it up.