RF module help needed......

Idea is this: I need a VHF RF module to transmit data from a remote autonoums robot to a host pc located a few 100 meters away. The robot has to wirelessly transmit it with proper security cause we dont want interference from other sources... anyone got any suggestions?? i need links to sites so i can order the parts.

thank you.

433mHz transmitters and receivers are available and Mouser (www.mouser.com) has surface mount antennas. Check out **broken link removed**
The coding is something you will have to work out