At the risk of being a bit of a killjoy, what you are about to do is rather antisocial, not to mention illegal.
The frequency of 110 to 120 Mhz you mention is at the bottom end of the the aircraft band, lots of navigation beacons and such like. Who asked you to build a transmitter on such a frequency?
If you want a crystal controlled transmitter (FM) for VHF with a reasonable amount of deviation, you will either have to use a phase locked loop, or a low frequency crystal modulated using a varicap (varactor) diode, and several stages of frequency modulation to get up to the desired output frequency.
JimB