This is the schematic for a FM transmitter with 2W output power that can be used between 85 and 110 MHz. Build the transmitter in a RF-proof casing, use good connectors and cable and be aware of all the other RF rules of building. Q1 and Q2 should be cooled with a heat sink. the 22pf variable capacitor is for the frequency adjustment. The another trimmer must be adjusted to maximum output power with minimum SWR and input current.
2N3866, 2SC1971 or 2N3553
5 turns of 0.8 mm wireon 5 mm body with ferit core
2-4 turns of ordinary Cu-PVC isolated wire over L1