I don't know if there is a typical installation location. It all depends on how your show is set up and your local climate.
Personally, being from the Buffalo, NY area with the potential of lots of snow during my show season, I won't be putting it outside. If there are any problems with the conductor or EtD, I don't want to have to be going thru snow to fix it. Plus, if the audio is coming from this, it means that my FM transmitter would also be outside. Too much potential for problems with the weather for me to risk that.