Hi,
You should take care about the connection of the antenna pin on the pcb, and the the dimesioning of the antenna itself.
Try to solve the problem step by step. If you don't have a spectrum analyser, use the receiver module RSSI pin to verify the transmitter power output. First do the measurement on the breadboard, after that solder the transmitter module on the pcb and do the measurement again (use the receiver module in the same configuration for the both cases). The transmitter output has to be around 1mW (0 dBm), so you should connect the receiver input to the transmitter through an adecvate (at least 20 dB) attenuator. If all these are verified, test the antennas.
Good luck.
Al