I made a very short search on the Internet and found this interesting page:
**broken link removed**
Audio and RF oscillators RARELY share the same design concept.
Inductors generally become more efficient as the frequency rises (less coil turns, air rather than iron core), so LC audio oscillators are more difficult to design.
RC (coilless) circuits (Wien bridge, twin-tee, phase shift) are far more suited to audio rather than RF.
You can also google for "FM transmitter" or "VFO" and find many more oscillator circuits.
You can finally do some googling on "QRP". QRP are acual low power amateur radio transmitters that can be easily used as good quality sine wave RF oscillators.