Transmission

[Andy]

For FM transmitters:

http://www.veronica.co.uk/ and http://www.broadcastwarehouse.com/

and AM:

http://www.vintage-radio.com/reviews/transmitters.shtml and

http://www.zen22142.zen.co.uk/Circuits/rf/amtx.htm

As you can see, the last one is very simple, just a modulated VFO. It'll probably be a mixture of AM and FM.

There is loads of info on the net about transmitters, just do a search for AM transmitters or FM transmitters.