When you need to go beyond 20 meters, we recommend our powered, active antenna. It has two antennas inside, one for transmit, one for receive and both are boosted with amplification. This solution is rapidly becoming a winner when external radiation from other antennas start to interfere. We have 40 Meters (131 feet), 70 Meters (230 feet) and 88 Meters (288 feet)-Special order. Part numbers ASE-AA515 and add the cable length (-40, -70, -88).