OpenSky is a proprietary trunking radio that is designed to carry both voice and data traffic. the protocol is marketed as to be secure and private. Opensky operates on the 700, 800, and 900 MHz bands. OpenSky was originally developed by M/A-Com as part of the Monarch wireless voice and data system for FedEx in the 90s. Later M/A Com was purchased by Tyco Electronics who was then purchased by Harris RF Communications.