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http://cartech.about.com/od/Multimedia/a/Mobile-TV.htm :
In order to watch mobile TV on the road, the basic components that you’re going to need include a:
- display
- tuner
- antenna or satellite receiver
If you have an existing mobile video system in your vehicle, then you’re probably set as far as the display is concerned.
You’ll just want to check if your existing screen has multiple inputs. If it doesn’t, you’ll need some type of external splitter or input selector. A lot of video head units have multiple inputs, though, as do roof- and headrest-mounted screens.
The tuner is the component that receives an over the air (OTA) signal and converts it into something that your screen can display.
In the United States, you’ll need an ATSC tuner that’s capable of receiving digital, high definition broadcasts.
Some tuners have built-in antennas, which is the easiest way to receive wireless TV on the road. However, an external antenna will typically be able to pull in weaker signals.
If you’re in an area that isn’t close to any broadcast antennas, a good, omnidirectional, external antenna is a must.
However, there are a lot of places where you won’t be able to receive any OTA signals at all.
The other main option for wireless TV is a satellite receiver. These are now available in both dome and flat configurations that are suitable for use on RVs and passenger vehicles alike. If you want to watch mobile TV on long road trips that will take you well outside major metropolitan areas, a satellite receiver will do the trick.