Eli Brigge and colleagues just published a nice article detailing their open-source RFID logger. The article is in open access: https://www.frontiersin.org/articles/10.3389/fevo.2019.00257/full
They share designs, part lists and scripts. The designs have been tested with bird species, but they should be applicable to other animal groups.
They also list other project that have used RFID loggers in avian ecology, and other manufacturers.
Now, we just need to add satellite communication :)