Roamio Plus wireless to Mini?

I have my Roamio Plus in the basement of our home, with an RF cable from the cable modem to the Roamio Plus. I would like to be able to watch recorded shows from the Roamio Plus on a Mini, which would be on the second level of our home, but there is no way to get an ethernet or coax line to it.

I know Tivo decries the use of wireless, yet I read of Forum posts saying "no problem." My basic question is: is it possible to do what I want, and what do I need in order to accomplish it?

Thanks in advance:)