I'm in Paris for several months and my tv (4) pixellisaient (especially TF1 and M6) and especially at peak hours. so I put this filter 3G / 4G and it's great ... more interference, and my 4 TVs work very well, the filter is placed at the entrance of the installation, before the dispatcher. (My problems were not on TNT HD) Attention to the installation diagram supplied with the filter, the connection is backwards. We need to finish the antenna on the male part of the filter opposite the mark "one for all" and use the output of the female the male adapter if necessary (supplied) Now you know everything ........ Needless to say that I do not regret this purchase