Get it here:
http://www.avelectronic.com
The unit works great; I have it in my FX and am helping DSMercado install his this coming Saturday. The Nav-TV contains a signal booster that amplifies the weak signal coming out of the DVD player so that you can run multiple (up to three, including the nav screen and rear screen) screens. Te vid. wire from the player is not simply tapped, it is cut and run through the Nav-TV, amplified, then run back out to the Nav screen and rear screen via it's RGB and RCA outputs respectively. The only downside to this is that you must turn the Nav-TV unit on in order to view a DVD in the rear even if you are not using the front, since the signal now runs through the box as opposed to directly to the rear screen. The addition of a three way switch rectifies this and also allows a DVD to be played in the rear while simultaneously watching TV up front. The unit comes with a parking brake safety wire that, when connected to the brake, only allows playback while the brake is engaged, but all you do is run this wire to ground and it is bypassed. Install is pretty straight foreward; just takes time.
Feel free to ask any questions.
Oh, also AV Electronics now has two diff. units: One has the TV tuner (Nav-TV), the other does not, but has a few different features.
I chose not to connect and run the TV antennas b/c during experimentation, I couldn't get reception while moving. This weekend, we'll be installing the optional amplified antenna (you can connect two of them) and checking out how it does. If this works, I'll likely go ahead and hook it up on mine.