The purpose with this report is to summarize the activities within the project Adaptive Radio Node (ARN). The possibilities to obtain adaptive capabilities for radio nodes in a net structure have been studied. The aim has been to obtain knowledge both about what possible gains can be achieved with adaptivity and also about of how new technical methods will work in military environments. With adaptivity we mean that the radio node can adapt to the radio channel, the needs of the users and to the properties of the network. The focus has been to study technical solutions which give adaptivity at the link level by using advanced radio signal processing. A system model based on the modulation method OFDM has been developed. Parts of the system model (OFDM, adaptive modulation, receive diversity) have been implemented in software and constitute the technique kernel in a demonstrator. The purposes with the demonstrator are to be a tool for development and to illustrate the benefits with adaptivity. Field trials have been carried out to investigate the spatial properties of the radio channel. Also, the impact of interference on digital radio systems has been investigated. The project goal to prove the advantages of adaptive capabilities in radio nodes has been reached and the competence will be used in the development of future tactical radio nets.