Barrowboy 0 Posted September 20, 2018 Hi Guys. Nick here from Los Angeles. I'm installing a TVI camera in an elevator in a 5 storey apartment block. The only travel wire available is a shielded 18/2 stranded pair. Is there an active Balun that will work or do I have to go wireless. Thanks in advance. Nick. Share this post Link to post Share on other sites