Here is the schematic, for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet.use very smooth power supply for this i recommended 12V car battery.
You can increase the range up to 5km wen you change the Q1 to BFY52,2N3632, BLY89A.L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm.
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