Can you give a link to the RF modules (just copy the url in the text).
Is the Freeduino like a Arduino Uno ?
How is it connected ?
The best way to test it, is with the SoftwareSerial, http://arduino.cc/en/Reference/SoftwareSerial
If you create a software serial port on both Arduinos and connect the RF module to those ports, the normal serial port is still available for the serial monitor of the Arduino IDE.
Your code is not wrong, but I don't understand how the serial data flow is going. The receiver is receiving data from the RF module ? But where is it sending data to with the Serial.println() ?
If you copy your sketch in a post, please put it between the code tags. The '#'-button is for the code tags. You see the button above the text input field.