Thanks for asking,
Quite simply, the difference between a TV and a PC has become less and less in recent years. A PC can be connected to a modern TV just as easily as a 'computer monitor'. The audio outputs from a PC can also be connected to an audio amplifier. HDMI is perhaps the easiest connection type to use, though older interface standards can be used if each device supports the desired standard.
In practice, a tuner device can be installed in a PC or the tuner can be connected to the PC via Ethernet.
Windows, MAC, Linux and other operating systems can be used to run several 'Media Center' applications that provide access to TV tuner, Blue-Ray, DVD, CD, local and web based video and audio, etc.
The HTPC can act as a recording device that can then serve the content to other PC's via Ethernet.
In my implementation, I've used the technology for two primary purposes. 1 - terminate a second, third or even fifth antenna so that I can view signals from various directions without using a rotator or expensive filter network or still more expensive active devices to combine the antennas. 2 - Record OTA TV to the hard drive of my PC for later viewing.
My tuners are made by SiliconDust and cost about $80 each. They connect to an antenna via a standard F-type coax fitting and on the other side, to my wired & wireless Ethernet LAN via a common 8 conductor (4-pair) CAT-5e patch cable. Any PC on my LAN can send commands to the tuners, and can receive data (the video, audio and on screen guide information) from the tuners. A wired Ethernet connection is more reliable than wireless when transferring video at up to 18 Mb/s per active channel.
One PC is connected to the TV in the living room. It's a direct connection using HDMI, so both video and audio are connected via the same cable. The TV screen is the 'monitor and speakers' for the PC. The TV antenna input is connected to the primary UHF + VHF antenna combination, which lets users who have no desire to use a PC access all but a few available channels. Switch the TV to HDMI input and you can use the PC to watch any internet content, any file on the LAN or local drive in the PC. This PC uses Linux, specifically Mythbuntu OS/Media Center.
Our Windows-7 PC and older XP box also can connect to the tuners and view live or recorded TV. I use my old XP box as a personal video recorder more often than any other machine.
Given the large number of TVs in your home, it may not be practical to dedicate a PC to each or some views would be resistant to learning/using the PC solution. So, would it satisfy the viewers in the home if some TVs had access to one market and other TVs had access to the other market? That would simplify the cabling needed for distributing multiple antenna feeds. Then, select TVs could have either a PC connected ans/or a second external tuner... in either case, allowing the TV access to both markets.
If you don't have CAT-5 or better data cabling installed, MoCA adapters provide an alternative. They convert wired Ethernet to RF that can be run over coax, giving you a means of getting an Ethernet connection to a TV location.
http://forum.tvfool.com/showthread.php?t=13034
http://forum.tvfool.com/showthread.php?t=13659