shahidali55 was talking about 433MHz... if you build that LC Oscillator circuit as shown, it'll move by several MHz if you approached it with your hand or finger (or even if it's damp or dry weather!!). Also, you're keying the Oscillator on/off with a square-wave (rich in harmonics), that alone would guarantee out-of-band radiation. Unless it's professionally built to extremely high tollerances with a lot of consideration to board layout, I'll stand by the comment it's unsuitable. A SAW resonator is a completely different ball game - but this isn't - it's a crude one-transistor LC Oscillator...