How much memory do you recommend to run your software?

Yes, if you want to analyze typical filters, couplers, manifold multiplexers, single horn antennas etc. which are based on the  mode matching technique elements then this will be sufficient. Even running uWave Wizard on a netbook is efficient in the case that 3D-FEM computation is not in your focus. If you want to analyze and optimize more complex 3D structures and even use 3D finite elements, it'll not be sufficient - and too slow - either. We recommend a Desktop/Laptop with state of the art CPUs and least 1 GB RAM. In case of 3D-FEM elements and in particular computation of complete projects by 3D FEM a 64bit architecture and OS is recommended.