Any kind of RF interference at a call site will diminish connections to cell phones and cause poor service which leads to customer complaints. Unlike active interference from nearby antennas, PIM, or passive intermodulation interference, can be caused by many elements in and around a cell site on a tower. These conditions make PIM hard to detect and mitigate. Drew Martin, Sales Engineer-Interference with Valmont Telecom speaks with John Celentano, Inside Towers Business Edi...