Hi,..
Here you are a schematic for an FM transmitter. I've tried this circuit and it works perfect, it covers a range about 100meters.
1- This circuit is adjusted to (87.5,87.7,87.9) MHz.
2- The coil is 3-turns center-tapped(2-turns and 1-turn), of diameter 8mm and the wire diameter is like the core of the COAX cable.
3- Antenna is 1.5meters of any kind of wires.
Please let me know if something wrong happens.
If you could find a schematic for a receiver instead of an FM radio, please send it to me.
Thanks