I do mostly location sound

I do mostly location sound recording and video is somewhat of a hobby for me. What the two have in common is that there are times when we have to share mic resources with a PA system ( with or without operator present ). In self defense I had to build a mic splitter box which uses a high quality transformer to split a mic signal into two destinations. ( There are transformers which will split a mic to more than two destinations ) The transformer virtually isolates each load from the other so that your recording device is immune to any foolishness perpetrated by the PA guy. My box has four transformers in it. They are not cheap . . . . but think of the possibilities! You can charge extra duty for your wireless mic rigs which could feed the PA and your H4 which can record up to four discreet auduio channels if I'm not mistaken.