Simple and Powerful FM transmitter

This simple FM Transmitter is very powerful (mean its not simple one..! but its easy to make..). You can transmit FM signals up to 5km radius circle area using this Transmitter. I recommend to use 12V battery for supplying power. If you wish to use 12V AC-DC adapter you may want to make a very smooth DC out put using stabilizer, unless it will generate low frequency hum when listening to FM radio out put. For making L1 coil use 18SWG copper wire (about 1mm diameter) and make 7 turns. Use 75? TV cable's middle wire for antenna, It should be 2meters long