Correctly you say gentlemen forum users. There is a lot of material, only a specialist can figure it out. In order for even a non-specialist in electronics to understand, you need to have a special program. I found such a thing on the network, I don’t know the truth how to test it [DLMURL] https://www.paterva.com/web5/community/index.php?activate [/ DLMURL] This program is analytical with the intelligent search function. From the whole Internet it finds what it needs. But in the criminal investigation, gentlemen, probably there is no rubbish by definition, but there are operational materials. The whole selection is needed precisely because the “enemy" needs to be thoroughly known. If we know how the state blocks such "parasitic" channels in special institutions, then (TZI) will not pay attention to it, in ordinary offices and apartments ordinary people. A person’s apartment, his office where he works is full of various electronic devices, there is wiring, an electronic clock, walls can be made of reinforced concrete, but these are all sources and antennas of “parasites”, but this is how to connect to it, and you have to secretly. We already know that you need to have a radio with a certain sensitivity. Employees of the UR know, for example, that using a radio in the VHF band, you can safely open the cells of the left-luggage office at the stations. Or you need to bring a laptop with wi-fi to your apartment and connect. But this is an article of the Criminal Code. Does this event need to be done?