Adjustable NTSC video transmitter/receiver IC needed

Can anyone suggest a video transmitter and/or receiver IC for NTSC that allows me to tune the frequency? I need to have multiple cameras operating simultaneously in the 2.4GHz frequency band without interfering with each other, so I'm looking for a TX/RX pair that I can tune differently for each camera, but all within the 2.4GHz band so I don't break any FCC rules. I'm new wireless video so please let me know if my idea won't work for some reason. I only need to transmit very short distances, less than 20', so low power is preferable.