Ok gentlemen today I made a trip down to YUNEEC USA in Ontario, CA and chatted it up with the techs and others and here is what I found out.
The new ST16 controller will have a 3rd antenna as you have seen in the pictures floating around online. It is a directional antenna and even though I couldn't have one

they allowed me to take some pics of the antenna that will be added. Technically you can drill a hole in your ST16 and add this one in as there are enough slots on the boards internally to handle another pig tail connector...
I will OPT in for the mod once the antennas are avail and will post once done, and possibly a walk through while mod is being done...