I am using a Turnigy Tx units with the ER9X upgrade. I did not want a bulky mount for my Samsung 4 cell phone for the 3 DR system so this is what I did with plywood scraps, velcro, and zip ties. The long antenna is a true 1/4 wave length that I made(the supplied ones are useless). It may look a little long but the range is awesome. I plan on re-disging the antenna so it mounts in a more vertical orientation.