cc1101 module
This part has one connection to the antenna. In other words, it has an internal sp2t switch to select transmit or receive functions. So just adding an amplifier to boost power will not work. You would have to have an external pair of sp2t switches and an amplifier that only worked when you were transmitting. It can be done, but it a little complicated.
If it is a fixed position system, I would go with the higher gain antenna. You can easily print a directional antenna onto the pwb, although it will be somewhat large.