Changes

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 EM.Terrano gives you three options for the transmitter caseradiator associated with a point receiver set: * Half-wave dipole* Polarization matched isotropic radiator* User defined antenna pattern  By default, EM.Terrano assumes that your receiver, by default, is an isotropic radiatora vertically polarized (Z-directed) resonant half-wave dipole antenna. An isotropic radiator has a perfect omni-directional radiation pattern in all azimuth and elevation directions. An isotropic radiator doesn't exist 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.