There's this NTSC contraption, which is a wireless transmitter. I bought one for $9 but haven't pulled it out of the box yet.
There are also beaucoup 2-piece A/V transmitters/receivers that run over unlicensed frequencies. I have a 900MHz POS that has a manual fine tuning knob on the receiver. If you buy one of these, make sure it has AFC! Mine drifts so badly, you basically can't watch TV for long before the picture is unwatchable.
find a 2.4 ghz transmitter at perfect-10.tv search for wireless/ made by terk/then go to any satellite retailer and have them order it for you.goodluck