Blitz,
I bought just the headset, no wireless RX/TX. It has a 3.5mm plug that carries power and standard PAL format video from the Spy-car remote control hand unit. I threw together an adapter than has a 3.5mm socket on one end, and a RCA video plug and power plug on the other.
The wireless setup I used is one of those cheapo 1.2ghz ebay cameras, but you could use anything that outputs a standard video signal.

YHR,
The conversion is detailed here as I posted earlier:
http://jakeofalltrades.wordpress.com...unted-display/
By default the headset is PAL, so you have to (re)move a resister to make it NTSC. If you're planning on using *just* the spy-car video setup, you won't have to do anything. If you're going to use both the spy-car and another video source which is NTSC, you may want to connect a very small switch to the pads so you can convert it from PAL to NTSC and back.

D.