Do I need an analog to HD convertor? My roamio is not recognizing my antenna

Currently, with my TiVo BOLT VOX 500GB I'm using a cable card and MoCA for the internet to the box since the cable box is in another room. I'm looking to drop cable so no cable card and get an HD Antenna. My question is can I use a splitter to connect the MoCa and the HD Antenna to the BOLT...

Recently upgraded to Bolt (4 tuners, OTA compatible) from Premier (Series4, 2 tuners, OTA compatible). No cable. Antenna, splitter, and all coax remains the same. On Premier, I received 100+ channels from my balcony-installed antenna (Clearstream 2V) after going thru a single splitter...

I'm advising a friend who wants to cut the Verizon/DirecTV cord. Does the Bolt work without cable or DirecTV, with just an HD antenna? If it works with just an antenna, would my friend be able to use a small HD antenna in the basement next to the TV, or would he need a rooftop antenna? Thanks.

We just got hooked up to 100MB fiber optic internet service provider. I would like to combine HD antenna channels with streaming channels (DirectTV Now via Apple TV) using a TiVo box. Is this possible using a Roamio Pro? Can the antenna feed through the Coax input and the fiber optic streaming...