These are the options I am aware of:
ChannelMaster does have an OTA box, but it has very mixed reviews, and it is mostly for someone with a lot of technical skills. I don't know much about it.
The only real "DVR" is TIVO. The latest is the Bolt, and it can be OTA only with four or six tuners (I believe). It connects to your antenna and then directly to the TV via HDMI. It needs an internet connection for software, data, guide, etc. It is the most like a true DVR because of its direct connection to the TV and has its own storage device, which is now 1TB. It has a typical DVR interface and can be used for watching OTA or recorded shows with all the options of a DVR and has one additional feature. Within 24 hours of a broadcast of a primetime TV show on major networks, there will be an option to skip all the commercials as you play the recording. It works great.
These other three are all solutions to work within your home network: HDHomerun, TabloTV and Amazon Recast. Each of them has an antenna input and works with an ethernet or wireless connection to your home network. They cannot connect directly to your TV. The HDHomerun has either 2 or 4 tuners but does not have any storage. It records to a drive somewhere on your network. It can only be viewed through a streaming box, such as Amazon FireTV, Apple TV, Roku, nVidia Shield, etc. There is an app you would open, and then you can access it for either live or recorded TV. If you have a Plex Pass, I believe you can automatically fast forward past commercials.
The Amazon Recast and TabloTV have their own hard drives, but they still connect to your home network for viewing. The Amazon Recast only works with Amazon devices and must be set up from an Android phone. TabloTV works with any streaming box. I believe it also has an option to forward through commercials.
I have a TIVO Roamio OTA which I was able to get last year as a refub from TIVO for $229. It works perfectly and was well worth the money. It has 4 tuners, so I have no problems recording anything I want. TIVO usually holds sales around the holidays for their devices. I don't know the cost of the other devices, but I believe Recast has been pretty cheap when on sale, especially if you only want the 2 Tuner model which also has the smaller storage drive (though I think there is now a way to add storage to it). There is another box to watch your programs from another location. I don't know how well that works or what it costs. The other 3 can be watched at any locations you have a streaming device attached to your TV.
One other consideration is the cost of the guide data. The Roamio includes lifetime guide data in the cost. The new BOLT does not. HDHomerun and TabloTV charge for the guide data, but I believe they both have an option for a lifetime guide. Recast's guide data are free if you have a Prime account.
Pardon any inaccuracies. This is how I understand the current offerings.
SMK
ChannelMaster does have an OTA box, but it has very mixed reviews, and it is mostly for someone with a lot of technical skills. I don't know much about it.
The only real "DVR" is TIVO. The latest is the Bolt, and it can be OTA only with four or six tuners (I believe). It connects to your antenna and then directly to the TV via HDMI. It needs an internet connection for software, data, guide, etc. It is the most like a true DVR because of its direct connection to the TV and has its own storage device, which is now 1TB. It has a typical DVR interface and can be used for watching OTA or recorded shows with all the options of a DVR and has one additional feature. Within 24 hours of a broadcast of a primetime TV show on major networks, there will be an option to skip all the commercials as you play the recording. It works great.
These other three are all solutions to work within your home network: HDHomerun, TabloTV and Amazon Recast. Each of them has an antenna input and works with an ethernet or wireless connection to your home network. They cannot connect directly to your TV. The HDHomerun has either 2 or 4 tuners but does not have any storage. It records to a drive somewhere on your network. It can only be viewed through a streaming box, such as Amazon FireTV, Apple TV, Roku, nVidia Shield, etc. There is an app you would open, and then you can access it for either live or recorded TV. If you have a Plex Pass, I believe you can automatically fast forward past commercials.
The Amazon Recast and TabloTV have their own hard drives, but they still connect to your home network for viewing. The Amazon Recast only works with Amazon devices and must be set up from an Android phone. TabloTV works with any streaming box. I believe it also has an option to forward through commercials.
I have a TIVO Roamio OTA which I was able to get last year as a refub from TIVO for $229. It works perfectly and was well worth the money. It has 4 tuners, so I have no problems recording anything I want. TIVO usually holds sales around the holidays for their devices. I don't know the cost of the other devices, but I believe Recast has been pretty cheap when on sale, especially if you only want the 2 Tuner model which also has the smaller storage drive (though I think there is now a way to add storage to it). There is another box to watch your programs from another location. I don't know how well that works or what it costs. The other 3 can be watched at any locations you have a streaming device attached to your TV.
One other consideration is the cost of the guide data. The Roamio includes lifetime guide data in the cost. The new BOLT does not. HDHomerun and TabloTV charge for the guide data, but I believe they both have an option for a lifetime guide. Recast's guide data are free if you have a Prime account.
Pardon any inaccuracies. This is how I understand the current offerings.
SMK