Many problems with my WiFi system, untimely deactivations Internet connections, largely due to the reinforced concrete pipes and various premises. I then turned, after much hesitation, to the PLC systems (Power Line Carrier). Hesitation mainly because the user is amateur radio and I read a lot of opinion against the use of these systems supposed to generate many parasites on the radioéectrique spectrum. Nevertheless with up to four PCs can be connected simultaneously, I could not see myself pulling cables everywhere. So at first I bought a pack of three DEVOLO CPL 200 to test the system on two PCs. Do not forget that you need as many CPL boxes that connect to computers, plus one, used to send signals to the mains. I was pleasantly surprised at the ease with which connections are made: the perfect "plug and play"! Attaching and using ...! No more complicated. Thereafter I ordered a single additional case to complete the installation and operation of four PC. Four PC, four CPL, so it is missing the call; yes and no, except that the nearest PC to the router is directly connected by cable; this is not more complicated. Needless to say, this is not the same person who uses the four PCs simultaneously ...! Finally, I made a lot of plays on the HF bands from 3 to 30 MHz and I have, to my surprise, recognize that interference was detected when using the system at CPL. It was not done testing in the higher bands fault ad hoc availability of equipment. A small final point: it is better to pay the price and have quality equipment of good quality rather than savings candle end; you will eventually find his account. My conclusion: Product to procure eyes closed. Thank you for reading.