I have all ready answered your question. You will need TWO crystals. Then, you will connect both crystals to power. And then connect the one crystal's output to the PIC, and the other to the transmitter. Ok? That is about as simple as it can get.
I'm not being picky just for the sake of it, you mean >10~15MHz. Capitalisation is very important in engineering, m means milli and M means mega, the two are totally different, also pay attention to the difference between v and V, where the former means instantanious voltage and the latter rms voltage (in the context of a time varying voltage).
Mhz being written as mhz is a pet hate of mine, but I actually wasn't aware of your latter example. I've always reffered to volts as a capital V, and didn't realise that you could use a lower-case v for instantaneous voltage.