There are guides out on the benefits of upgrading a ST16 to a ST16+ (moving the internal antenna outside). I called Yuneec about purchasing either a set of antennas for the ST16+ (the 2.4GHz seems to have gone from the typical mushroom to what looks like a PCB version) or purchasing just the 5.8GHz antenna for the ST16. However, Yuneec does not have, nor are they willing to sell me any antennas. So, if one were to desire to upgrade their controller, other than the Itelite and/or FPVLR antennas, what antenna are folks using for the third one?