This TS835 FPV 5.8G 600MW 48CH (2-6S) Wireless AV Transmitter is perfect for the small budget multi-rotor. Works brilliantly in an atom and because of its low price you have no worries about throwing it around the sky.
A good little mod you can do is to simply solder a length of the single core wire to the SMA as this gives you more than enough range without the long hefty antenna.
Note: This product is available in 2 pcb colors, blue and green, which will be shipped randomly.
You can couple this 5.8GHz transmitter with our FPV cameras,