I like my TiVo and have both a Roamio OTA and a BOLT. The Roamio OTA does not have the ability to stream to another device like the BOLT, but the Roamio OTA can be purchased with a lifetime subscription for there are no monthly program guide costs. A lifetime subscription for the BOLT, just the subscription, is more than the cost of the Roamio OTA with the lifetime subscription.
If you are not receiving all the channels you should be, then first is to see why they are not coming in now. If you have a digital tuner now and are not getting all the channels, then you most likely will not get all the channels with a TiVo until you find out why they are not being received.
First let us know what you have for an antenna, your tvfool listing, and what you want to get.
Larry1 I have a Samsung smart television in which I have one of the antenna that would help connecting my to the internet. My other television isn't a smart tv but it's a Olivia and the atena that I have for pickups all the channels. I don't know if it's because of different models or the atena.