What frequency? Do you need sound as well? Your posts are a little confusing, do you need both the transmitter and receiver? Seems like a lot of work and trouble, I've got 7 wireless cameras, all came with transmitter built in, the receivers, and wallwarts to power them all. The most expensive was $34, cheapest $19... Not suggesting you buy them, and remove the case, just pointing out how dirt cheap they are to purchase ready to use.
But, if you need help, you need to be a little clearer on your project, right now I can only guess. Don't get excited though, I don't do much RF stuff, usually more functional to buy, than to build. In the past, my home built device have poor range, and a lot of noise, tend to drift...