9 Active and passive construction units, namely, housing for stationary radio and television receiver installations; satellite dishes; radio and television installations and accessories therefor, namely, RF amplifiers and coaxial cables; lightning conductors, lightning rods, radio and aerial masts; measuring, checking and surveillance and testing devices for aerial installations; electric connectors and couplings; electrical apparatus and switching apparatus, namely, RF switches; electrical control panels and distributors; broadcasting stations and transmitters; devices for wired for wireless transmission and receiving technology, namely, RF and cable frequency receivers; amplifiers; electric and non-electric checking and supervision, measuring and signaling apparatus and devices for communications technology, namely, RF and cable frequency testers