OTA or Mini

Good morning.



I currently have a Tivo Roamio and a mini. I want to add another Tivo or mini into the mix for another room.



Question:



Will the Tivo OTA "work as a mini and let me watch recorded shows and such from my original Roamio or do I need the mini to do that? (asking because of cost difference).



If went with OTA would splitting my antenna signal work and allow me to watch different show in different rooms?



Thanks for the input.