Improve performance and Keep Your Costs Under Control by Ensuring Your Microwave Network is ALWAYS Up-To-Date. Aviat’s Microwave Upgrade Agreement (MUA) is a long term (10 year) network plan that provides seamless and regular full turnkey technology upgrades, with the highest reliability, full service and support, and an easy OPEX-like financing model. Aviat’s MUA gives you full operational confidence and eliminates the uncertainty of whether your network will continue supporting your needs into the future.