IC756PRO SPECTRUM SCOPE versus PLCs

Icom IC-756PRO spectrum scope used to characterize interference in ham bands, presumably by the usage of PLCs. During the video the attenuation will be turned on, the pre-amp will be turned on and the exterior antenna (installed up on the roof) will be switched to an internal antenna (just 40cm of copper wire) to show that the interference did not had its origin inside the QTH.