Passive filters designed for the attenuation of signals transmitted over the 4G telephone band (ex Television UHF channels E61 .. E69). These filters differ in selectivity, type and field of application. They are all made of die-casting connectors or IEC, just to make them suitable to be inserted at any point in the distribution system. The two best performing models, with regard to the steepness of the cut between the TV band and 4G band (LTE), are made according to the ultimate technology and comply to the specifications included in the CEI guide 100- 7 (typical case). All the others have a less pronounced transition, are made with LC-type cells, and can be used to integrate the models described above, or where the risk of interference is not particularly high.