*Using the "Basic Link" wizard
=== Defining a Transmitter Set in the Formal Way ===
Transmitters act as sources in a propagation scene. A transmitter is a point radiator with a fully polarimetric radiation pattern defined over the entire 3D space in the standard spherical coordinate system. By default, [[EM.Terrano]] assumes that your transmitter is a vertically polarized half-wave resonant dipole antenna. This antenna has an almost omni-directional radiation pattern in all azimuth directions. It also has radiation nulls along the axis of the dipole. You can override the default radiator option and select any other kind of antenna with a more complicated radiation pattern. For this purpose, you have to import a radiation pattern data file to [[EM.Terrano]]. You can model any radiating structure using [[EM.Cube]]'s other computational modules, [[EM.Tempo]], [[EM.Picasso]], [[EM.Libera]] or [[EM.Illumina]], and generate a 3D radiation pattern data file for it. The far-field radiation patter data are stored in a specially formatted file with a "'''.RAD'''" file extension. This file contains columns of spherical φ and θ angles as well as the real and imaginary parts of the complex-valued far-zoned electric field components '''E<sub>θ</sub>''' and '''E<sub>φ</sub>'''. The θ- and φ-components of the far-zone electric field determine the polarization of the transmitting radiator.
</table>
=== Defining a Receiver Set in the Formal Way ===
Receivers act as observables in a propagation scene. The objective of a SBR simulation is to calculate the far-zone electric fields and the total received power at the location of a receiver. You need to define at least one receiver in the scene before you can run a SBR simulation. Similar to a transmitter, a receiver is a point radiator, too. However, unlike the transmitter case, [[EM.Terrano]] assumes that your receiver, by default, is an isotropic radiator. An isotropic radiator has a perfect omni-directional radiation pattern in all azimuth and elevation directions. An isotropic radiator doesn't physically exist in the real world. But the assumption of a default, polarization-matched, isotropic receiver is a convenient choice to generate received power coverage maps of a propagation scene. You might also define a complicated radiation pattern for your receiver set. In that case, you need to import a radiation pattern data file to [[EM.Terrano]]. Note that you can simply use the data file "DPL_STD.RAD" for that purpose, which is also used by [[EM.Terrano]] for the definition of the default vertical half-wave dipole transmitter.