New to Tivo need help connecting 2 devices

Please excuse my ignorance on this but I have an OTA antenna and a pre amp running to the existing CATV splitter on the side of my house going to 4 tv's one of which has a Roamio OTA. Wife is asking to add a Mini to the master bedroom tv. Roamio is connected wireless to my internet. What are my options to accomplish this request?

thanks in advance for the help.