To place an antenna (for now the only type available is center fed thin dipole antenna) click the button "Dipole Antenna" and then click twice on the canvas to place the endpoints of the antenna. Click on an antenna to open its control panel and use the sliders to adjust, amplitude, phase and feed separation. You can also choose to delete and individual antenna by clicking the red "Delete" button at the bottom of the control panel. The simulation displays fields on the same 2D plane that contains all antenna wires: The electric field (E) lies in that plane and the magnetic field is perpendicular to it. The Poynting vector (energy flux) lies in the plane. There are global sliders that let you change the frequency of the surceases and the speed of light in the simulation.